Hello!
While working on my other mod (#1220482344528510987), I noticed that the current Steamodder API does not support easily adding stuff like vouchers, blinds, or tarots.
So, I decided to make my own API mod to ease that option!
You can download the API from here: https://github.com/itayfeder/FederAPI-Balatro/tree/release
I hope it helps you create mods in an easier way!