Back in the seventies and eighties, when Marvel Comics had yet to become a cesspool of woke craziness and child propaganda (though parents at the time would probably argue it had other sinister aspects), the imprint published a semi-regular comic entitled What If?
Like the Apocrypha, What If? was non-canonical. Its readers understood its stories were even more imaginary than usual, in the sense that they were not intended to be part of any character’s regular ongoing narrative arc. A What If? story was the Butterfly Effect dramatized. Take a famous comic storyline and make one small change in the circumstances or choices of the characters, then see how it plays out differently with all its unexpected consequences.
Like the multiverse before anyone came up with that nonsensical idea.