No. Cheerleader rules are included in the Exhibition and League rulebook (PDF version free in the Print and Play folder here: https://www.dropbox.com/sh/ymvrc36q7ku8u1f/AADwbJ8cK-GYHYeBKKcKZaNla?dl=0 ).
An optional rule lets you use cheerleader figures instead of Reroll Edge tokens, which leave more Reroll Edge tokens available.
A future stretch goal will unlock a ruleset for an optional Pre-Game Cheerleader Showdown minigame.
And, of course, cheerleaders are awesome eye-candy for you team and look great when painted and cheering their teams on to victory