Getting DLC From Steam / Do I Have To Repurchase DLC

Hello! I’ve recently bought a MacBook and am going to be switching from Windows to Mac. I plan on playing The Sims 4 on the Mac, but I’ve bought all my DLC packs on Steam with my previous laptop. Although the problem is that Steam doesn’t support the Mac version of the game. The question that I have is: Will I be able to play the game with all my DLC packs without having to repurchase everything?