magento2.3 – Magento 2 – $ 1 configuration Shipping promotion code

We are changing to Magento 2.3 and it seems that we can not find a way to set up a promotion that we do often: "Shipping $ 1 for orders over $ X". Previously, we would configure this code as a Shopping cart price rule and link it to the applicable shipping method through the Shipping price rules. M2 does not seem to have a Shipping Price Rules page and there is no field to set a flat rate shipping price in the Purchase Price Rules. Could someone provide a solution to this situation? Does this require the purchase of an extension?