Main reason I ask is due to people like Tom Holland. When he was contracted by Marvel, it was for 3 solo Spider-Man films, and then 3 appearances in other films (these being Captain America: Civil War, Avengers: Infinity War, & Avengers: Endgame).
I was curious, has there been any similar contract revealed for Evan Peters? After all, Multiverse of Madness could theoretically bring him in from the multiverse.