He played college football for the Michigan Wolverines, winning three consecutive Big Ten Conference titles and a national championship in 2023.

In 2018, he caught 50 passes for 826 yards and 12 touchdowns, leading the Bruins (8–2) to the New England Prep School Athletic Council Mike Silipo Bowl Game.

Selected to play in the U.S. Army All-American Bowl, Johnson ran for a score and returned a kickoff for a touchdown.

A two-time All-New England honoree, he concluded his high school football career with 2,167 receiving yards and 33 touchdowns.

[8] On September 18, he connected with Cade McNamara for an 87-yard touchdown reception, the third longest catch in Michigan football history.