Personalization: I successfully modified a WordPress plugin, but where and how should I correctly implement the changes?

I've added the following 2 email merge tags to a WordPress membership plugin, and everything works perfectly. I know this is not a good idea as the changes will be overwritten when the plugin is updated. However, I am struggling to train how to add my changes without directly editing the plugin. I've tried a few things in functions.php, but none of them worked.

Any help or guidance would be welcome.

I want to add the following:

'membership_30'             => date_i18n( wc_date_format(), $expiration_date_timestamp - 30 * DAY_IN_SECONDS ),
'membership_14'             => date_i18n( wc_date_format(), $expiration_date_timestamp - 14 * DAY_IN_SECONDS ),

to the next section:

$email_merge_tags = array(

from this file:

plan_editable ) {

            $this->description .= ' ' . sprintf(
                /* translators: Placeholders: %1$s - Opening  HTML tag, %2$s - Closing  HTML tag */
                __( 'You can edit the content of this email for %1$seach one of your plans%2$s individually.', 'woocommerce-memberships' ),
                '', ''
            );
        }

        parent::__construct();
    }


    /**
     * Checks if it's a customer email.
     *
     * @since 1.7.0
     *
     * @return true overrides parent method to always return true
     */
    public function is_customer_email() {
        return true;
    }


    /**
     * Parses the email's body merge tags.
     *
     * @since 1.7.0
     */
    protected function parse_merge_tags() {

        if ( ! $this->object instanceof WC_Memberships_User_Membership ) {
            return;
        }

        $user_membership = $this->object;
        $membership_plan = $user_membership->get_plan();

        // get member data
        $member            = get_user_by( 'id', $user_membership->get_user_id() );
        $member_name       = ! empty( $member->display_name ) ? $member->display_name : '';
        $member_first_name = ! empty( $member->first_name )   ? $member->first_name   : $member_name;
        $member_last_name  = ! empty( $member->last_name )    ? $member->last_name    : '';
        $member_full_name  = $member_first_name && $member_last_name ? $member_first_name . ' ' . $member->last_name : $member_name;

        // membership expiry date
        $expiration_date_timestamp = $user_membership->get_local_end_date( 'timestamp' );

        // placeholders
        $email_merge_tags = array(
            'member_name'                 => $member_name,
            'member_first_name'           => $member_first_name,
            'member_last_name'            => $member_last_name,
            'member_full_name'            => $member_full_name,
            'membership_plan'             => $membership_plan ? $membership_plan->get_name() : '',
            'membership_expiration_date'  => date_i18n( wc_date_format(), $expiration_date_timestamp ),
            'membership_expiry_time_diff' => human_time_diff( current_time( 'timestamp', true ), $expiration_date_timestamp ),
            'membership_view_url'         => esc_url( $user_membership->get_view_membership_url() ),
            'membership_renewal_url'      => esc_url( $user_membership->get_renew_membership_url() ),
        );

        if ( FrameworkSV_WC_Plugin_Compatibility::is_wc_version_gte( '3.2' ) ) {

            foreach ( $email_merge_tags as $find => $replace ) {
                $this->placeholders( '{' . $find . '}' ) = $replace;
            }

        } else {

            foreach ( $email_merge_tags as $find => $replace ) {
                $this->find( $find )    = '{' . $find . '}';
                $this->replace( $find ) = $replace;
            }
        }
    }


    /**
     * Returns the email default body content.
     *
     * This method should be overridden by child classes.
     *
     * @since 1.7.0
     *
     * @return string HTML
     */
    public function get_default_body() {
        return '';
    }


    /**
     * Returns the email body content.
     *
     * @since 1.7.0
     *
     * @return string HTML
     */
    public function get_body() {

        $email_id = strtolower( $this->id );

        /**
         * Filters the membership email body.
         *
         * @since 1.7.0
         *
         * @param string $body email body content
         * @param WC_Memberships_User_Membership_Email current email instance
         */
        $body = (string) apply_filters( "{$email_id}_email_body", $this->format_string( $this->body ), $this->object );

        if ( empty( $body ) || ! is_string( $body ) || '' === trim( $body ) ) {
            $body = $this->get_default_body();
        }

        // convert relative URLs to absolute for links href and images src attributes
        $domain  = get_home_url();
        $replace = array();
        $replace('/href="https://wordpress.stackexchange.com/(?!https?://)(?!data:)(?!#)/") = 'href="' . $domain;
        $replace('/src="https://wordpress.stackexchange.com/(?!https?://)(?!data:)(?!#)/")  = 'src="'  . $domain;

        $body = preg_replace( array_keys( $replace ), array_values( $replace ), $body );

        return $body;
    }


    /**
     * Enables the email.
     *
     * @since 1.11.0
     */
    public function enable() {

        $email_settings = get_option( "woocommerce_{$this->id}_settings", array() );

        $email_settings('enabled') = 'yes';

        update_option( "woocommerce_{$this->id}_settings", $email_settings );

        $this->enabled = true;
    }


    /**
     * Disables the email.
     *
     * @since 1.11.0
     */
    public function disable() {

        $email_settings = get_option( "woocommerce_{$this->id}_settings", array() );

        $email_settings('enabled') = 'no';

        update_option( "woocommerce_{$this->id}_settings", $email_settings );

        $this->enabled = false;
    }


    /**
     * Returns the email schedule, in days (if applicable).
     *
     * @since 1.11.0
     *
     * @return int number of days (minimum 1)
     */
    public function get_schedule() {

        $schedule = null;

        if ( ! empty( $this->schedule_name ) && is_string( $this->schedule_name ) ) {

            $email_settings = get_option( "woocommerce_{$this->id}_settings", array() );
            $schedule       = ! isset( $email_settings( $this->schedule_name ) ) || ! is_numeric( $email_settings( $this->schedule_name ) ) ? $this->default_schedule : $email_settings( $this->schedule_name );
        }

        return max( 1, (int) $schedule );
    }


    /**
     * Sets the email schedule (if applicable).
     *
     * @since 1.11.0
     *
     * @param null|int $days number of days to set the schedule (cannot be lower than 1)
     * @return false|int returns false upon failure or gives the number of days set upon success
     */
    public function set_schedule( $days = null ) {

        $success  = false;
        $schedule = null === $days ? $this->default_schedule : $days;

        if ( ! empty( $this->schedule_name ) && is_string( $this->schedule_name ) && is_numeric( $schedule ) ) {

            $schedule       = max( 1, absint( (int) $schedule ) );
            $email_settings = get_option( "woocommerce_{$this->id}_settings", array() );

            $email_settings( $this->schedule_name ) = $schedule;

            if ( update_option( "woocommerce_{$this->id}_settings", $email_settings ) ) {
                $success = $schedule;
            }
        }

        return $success;
    }


    /**
     * Returns the arguments that should be passed to an email template.
     *
     * @since 1.12.0
     *
     * @param array $args default args
     * @return array associative array
     */
    protected function get_template_args( $args = array() ) {

        return array(
            'user_membership' => $this->object,
            'email'           => $this,
            'email_heading'   => $this->get_heading(),
            'email_body'      => $this->get_body(),
            'sent_to_admin'   => $this->sent_to_admin,
        );
    }


    /**
     * Returns the email HTML content.
     *
     * @since 1.7.0
     *
     * @return string HTML
     */
    public function get_content_html() {

        $args = array( 'plain_text' => false );

        ob_start();

        wc_get_template( $this->template_html, array_merge( $args, $this->get_template_args( $args ) ) );

        return ob_get_clean();
    }


    /**
     * Returns the email plain text content.
     *
     * @since 1.7.0
     *
     * @return string plain text
     */
    public function get_content_plain() {

        $args = array( 'plain_text' => true );

        ob_start();

        wc_get_template( $this->template_html, array_merge( $args, $this->get_template_args( $args ) ) );

        return ob_get_clean();
    }


}

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