Loot injection

How your items reach loot you do not own. The answer depends entirely on the container.

Container	What to do	Page
a Devil Fruit box (wooden, iron, golden)	nothing: registering the fruit is enough	Devil Fruit boxes
a chest or any container that places every stack it rolled	a JSON modifier using akumalib:roll_table	Chests

Why two mechanisms

Minecraft loot tables do not merge: two data packs providing the same table path do not add up, the last one loaded wins. So an addon cannot ship its own copy of somebody else's table. A chest can be extended from the outside by adding a roll on top of what it produced; a Devil Fruit box cannot, because it hands out a single fruit. The library therefore uses a different mechanism for each.

Nothing here can be checked without running the game

Neither javac nor gradlew build sees whether an injection fired, whether a modifier resolved, or whether an item came out. And a rate needs more than one sample: one box proves the wiring, ten start to say something about the odds.