Does anyone know how to set the remover tool as a reward? I see it as a "used by" option, but I am unsure how to set it up

I was assuming I'd just make a command that would do it for a certain price

remove.target n <player> 300 1

(normal remover, 300 seconds to use it, only remove one item per purchase from RP store)

However, I have no idea how to make it target the player purchasing.