how to make a hook for this datapack to interact with other datapacks (and vice versa)

i am currently remaking a modal based open source datapack based off of Kaze emanuar's super mario 64 chaos edition (i made it but did not finish it back befor macro functions). i am currently having trouble with getting other datapacks to hook in a way i can call their main function if their datapack is chosen via a randomizer.