Unicopia/src/main/resources/data/unicopia/recipes/arrow.json

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "X",
    "#",
    "Y"
  ],
  "key": {
    "#": {
      "item": "minecraft:stick"
    },
    "X": {
      "item": "minecraft:flint"
    },
    "Y": {
      "tag": "unicopia:magic_feathers"
    }
  },
  "result": {
    "item": "minecraft:arrow",
    "count": 4
  }
}