According to Indiewire, Ross is a fan of the show and visited the set last year. He met Mitch Glazer, the show’s creator, who was able to find a role for him. There is no word on how many episodes Ross will feature in but this is his first foray into acting so he may not appear much given his lack of acting experience.
Honestly, I don’t like it when non-actors get roles in movies and TV just because they’re famous. Maybe Ross has some hidden acting talents that he can showcase, otherwise he probably won’t make much of an impact on the show.