I created an item for a data pack (with a lot of NBT) that meanwhile can only be obtained via Piglins and Fischfang. Now I want to create another recipe. If that doesn't work, that's not so bad, I'm already working on more LootTables.
Do you mean recipe for crafting?
Yes, for the workbench.
Crafting recipes can only be created with plugins or mods, because commands can't be used to find out when a player opens his inventory
I'm not talking about commands, I'm talking about data packs. All recipes and loot tables are stored in data packs. Also e.g. The recipe for an iron pickaxe.
Mods also use datapacks to craft items.