audio – How to precisely configure YouTube volume?

Is there a better way than to slide the mouse to change the volume of YouTube videos? I mean, I can also change it using keyboard shortcuts, but they increase or decrease it by 5%, so if I want to set it to 3%, the only way I know of is multiple mouse attempts. So is there a better way to change the volume, or make keys to change it more accurately?

PS1, it seems that there are some Chrome extensions like "Magic Actions for YouTube", which help with the problem, but I already use too many extensions and I prefer another way, be it the YouTube option or the use of some tool / developer code simple.

P.S.2, I have VERY limited knowledge of JS, so complicated JS codes might not be a good choice for me, as suggested in some similar YT control questions.

Thanks in advance for any assistance.