Marvel head of TV Brad Winderbaum was asked about Jeff coming to the MCU, and he confirmed that yes, it is happening,

Man, and Wolverine on its roster, Marvel Rivals has a surprising star of the show. That star is Jeff the Land Shark, who has become a figurehead for the game over the past few months. Rivals might have even kickstarted Jeff's movie career,

Celebration event in Marvel Rivals adds several new skins for you to get, including the Cuddly Fuzzlefin costume for Jeff the Land Shark.