minecraft-assets/assets/minecraft/recipes/bone_meal_from_bone.json

{
  "type": "crafting_shapeless",
  "group": "bonemeal",
  "ingredients": [
    {
      "item": "minecraft:bone"
    }
  ],
  "result": {
    "item": "minecraft:dye",
    "data": 15,
    "count": 3
  }
}