Loot Table Command Issue (1.16.5)

I've been trying to make a mod with structures with custom loot tables. I've tried the data command and the set block command. (what i tried: /data merge block ~ ~2 ~ {LootTable:"treetable"}, setblock ~ ~2 ~ minecraft:chest{LootTable:"structures_plus:chests/treetable"} destroy). I'm on a Mac, my loot table is called "treetable", it's type is chest/chests, and the name of the mod structures plus.