Hello, I recently implemented this feature for my private SMP and just came by to check if something like this already existed on PMC. Anyways, I ended up comparing our solutions and now I can't help giving my share of criticism:
When hooking up events to eating items, you should not be using scoreboard triggers for this. Instead, please use the much better alternative of using the 'minecraft:consume_item' advancement trigger to grant an advancement that rewards a function that executes your event and revokes the advancement.
Here a quick list of what this improves:

• The advancement will only run any tests when the player actually consumes something, rather than once every 3 ticks per player.
  
• No scores will be needed. This removes the need for init and install/uninstall functions. Excluding the decorative advancement tab, this allows your entire data pack to only need two files in total, both of which are very short.
• This technique allows you to directly test for the used item alongside any of its properties, so it would be powerful enough to support adding custom effects to items depending on custom nbt or depending on which item group they are in. This is mostly relevant for potential future projects.

If you're still unsure of how exactly that would be implemented, please feel free to ask in a comment.

nice, but without the fix of MC-157116, its kinda annoying to glow when planting them instead of eating