Nebraska quarterback Dylan Raiola will have a unique opportunity to learn from one of the game’s best this offseason. The five-star freshman revealed following the Cornhuskers’ spring game Saturday that he will spend some time in Kansas City, where he plans to work out with Chiefs quarterback and three-time Super Bowl champion Patrick Mahomes. Raiola told reporters that he plans to finish up his first semester on campus, then get right back to work on the field with trainer Bobby Stroupe. Mahomes, who is one of Stroupe’s clients, will also be there to work alongside the young QB. “Time off mig…