BetterEnd/src/main/generated/data/betterend/recipes/tail_moss_dye.json

{
  "type": "minecraft:crafting_shapeless",
  "category": "misc",
  "ingredients": [
    {
      "item": "betterend:tail_moss"
    }
  ],
  "result": {
    "item": "minecraft:gray_dye"
  }
}