MCreator issue tracker has been migrated to GitHub.
Existing tickets have been migrated to GitHub. Please open new tickets on the GitHub tracker instead. If you do not have a GitHub account, all feature requests and bug reports from MCreator forums are still considered and checked by the maintainers.
You can add to vanilla mods by using minecraft namespace.
If you want to alter other mods, you can manually add loot table file in an appropriate folder depending on the modid.