Within the canon of the MCU, including the movies, comic books, tie-in novels, and animated series, is there any canonical information regarding the existence or non-existence of the Easter Bunny as actual physical creatures that exist outside of the in-universe popular culture?
For example, has the Easter Bunny ever been shown to exist, in a similar way to Thor and Loki being real characters upon whom the Norse myths are based?
Conversely, has the Easter Bunny been referenced as being a purely fictional character within the fictional setting of the MCU?
Answers citable to media only please, not supposition.