How to use custom item modifier in 24w10a

to clarify what I mean by custom item modifier: item modify entity @s weapon.mainhand [custom item modifier] Before it worked like this: { "function": "minecraft:set_nbt", "tag": "{ChargedProjectiles:[{id:\"minecraft:arrow\",Count:1b}],Charged:1b}" } Folder Path being: datapacks/[datapack name]/data/[custom name]/item_modifiers/[custom item modifier].json Now I tried it like this: { "function": "minecraft:set_nbt", "tag": "[minecraft:charged_projectiles=[{id:\"arrow\"}]]" } Using the same folder path but it doesnt work, tried a few things but none worked.