Test For A Specific Item In Head Slot & Then Activate Something Else

Hi All, I’m trying to create an addon in MCPE 1.16.2 but I’m struggling to do one thing. I want to be able to detect a player with an item on his head and then follow on with another command like giving him effects or a specific item. And when they take it off of their head, the effects/item disappear. There are ways to do it with command blocks like chain and repeat ones but I want to be able to do it all in a function file and I’m kinda new to that; Like does one function file do multiple commands. Like is there a way to do this using an execute command. Please Help.