Is there a way to make mobs spawn only in mansions?

you can't let mobs spawn in vanilla dimensions without coding right now.

I have an idea I don't know how to make it appear in the mansions but I know how to make it appear in the raids

method:

You just have to do a global procedure that makes every time a pillager, vindicator or evoker appear (depending on how difficult you want it to appear) with a probability of 3 percent for example, it does not generate it and generates your entity