Execute as specific item entity

Hey, I think there's a way to do this but I'm not smart enough to figure it out from reading the wiki. Can I execute a command as an item entity? For example, in my data pack I want to be able to run a command as every tnt item entity. If this is possible, how would I go about doing it? Thanks! I assume it will be something like execute as @e[type=item{<idk_what_goes_here>} run <commands> The @e[type=item{<idk_what_goes_here>} is what I need help with.