Oh, I see. I still would never call those other films MCU and you won't see Marvel themselves doing so. MCU is a brand/franchise label that encompasses specific films.
afaik there's not a catch-all label to encompass the other Marvel films. I suppose if I were organizing a game, I'd just call them "Miscellaneous Marvel movies" or something. (But I'd also hazard a guess that a majority of players playing those characters would be using 616/comics continuity and not the films....)