Programmable Items

I'm not too sure if programmable is the right word but here's what I'm trying to suggest;

A food item you can give to yourself with the hunger bars to be customizable, It could just be editing an existing food, like instead of a raw potato giving half a hunger bar it could give 3. Or it could be like the Light block where it's its own item with different levels going up to 20.

If you want to make a datapack, using a carrot on a stick, making a custom weapon would be difficult as it only has 20 durability. Removing 1 durability each time it's been used would be problematic, you could either make a new item with a right click function and higher durability or make durability customizable.