ActuallyAdditions/src/generated/resources/data/actuallyadditions/recipes/diamatine_boots.json

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "O O",
    "O O"
  ],
  "key": {
    "O": {
      "item": "actuallyadditions:diamatine_crystal"
    }
  },
  "result": {
    "item": "actuallyadditions:diamatine_boots"
  }
}