Flywheel/src/generated/resources/data/create/recipes/polished_limestone.json

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "XX",
    "XX"
  ],
  "key": {
    "X": {
      "item": "create:limestone"
    }
  },
  "result": {
    "item": "create:polished_limestone",
    "count": 4
  }
}