[2] Johnston later flipped his commitment to TCU, citing the dismissal of Texas wide receivers coach Drew Mehringer as the reason.
[6] Johnston was named first team All-Big 12 as a sophomore after catching 33 passes and leading TCU with 612 receiving yards and six touchdown receptions.
[12] He recorded his first career touchdown on a 1-yard reception from Justin Herbert in a Week 10, 38–41 loss against the Detroit Lions.
[13] His second came on a 6-yard reception from backup quarterback Easton Stick in a Week 15, 21–63 loss to the Las Vegas Raiders.
[16] In Week 18 of the 2024 season, Johnston secured 13 passes with a total of 186 yards in a 34-20 win over the Las Vegas Raiders.