The RPG Maker tutorial probably the closest to this (and RPG Maker is pretty easy to learn. It doesn't really use code the way Godot or Renpy. Easy engine to understand)
Also, the ones from above- I am pretty sure they use Unity. There are dollmaker templates for Unity surely, but it's an engine I'm unfamiliar with. There are other dollmakers on the app store that use Unity too and some around Itchio which is why I recognize them. I can't recommend it or anything, but possible starting place.
There's also more renpy templates out there surely that do this. I didn't add a lot to the page. I found this one quickly (Komi's Salon), and I am sure there's more because the Renpy community is gigantic. Obviously you'd have to change the UI though. UI stuff gets a bit tricky when you cannot code very well with Renpy in particular, but I don't think it's very hard either.
What engines do you own (or there any you are interested in using?