src/main/resources/assets/aether_legacy/recipes/holystone_brick.json

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "##",
    "##"
  ],
  "key": {
    "#": {
      "item": "aether_legacy:holystone"
    }
  },
  "result": {
    "item": "aether_legacy:holystone_brick",
    "count": 4
  }
}