Using Datapack in 1.8

Hi guys! I'm running an UHC/Battle Royale MC comp (on a server hosted on my own PC) with my friends. I told Gemini to make a datapack to manage the game, and it looks functional. However, the problem is that I want to use MC 1.8.9 as it's the best for PvP. Do you guuys know how I can get a datapack to run on a 1.8 PaperMC server?