Game not required to claim on Xbox or Playstation. Epic requires the game to claim DLC. Free for a limited time.
Xbox: https://www.xbox.com/en-US/games/store/crime-boss-rockay-city-heavy-hitters-pack/9NTRB90KDGVJ/0010
PlayStation:
NA - https://store.playstation.com/en-us/product/UP4040-PPSA06381_00-CBRCHEAVYHITTERS
EU - https://store.playstation.com/en-gb/product/EP4040-PPSA06382_00-CBRCHEAVYHITTERS
if you have problems using above links, try this regional free search link (first result): https://store.playstation.com/search/crime%20boss%20heavy%20hitters%20pack
Epic: https://store.epicgames.com/en-US/p/crime-boss--heavy-hitters-pack