jgl_sunlit_patch/kubejs/data/sophisticatedbackpacks/recipes/gold_backpack.json

{
  "type": "sophisticatedbackpacks:backpack_upgrade",
  "conditions": [
    {
      "type": "sophisticatedcore:item_enabled",
      "itemRegistryName": "sophisticatedbackpacks:gold_backpack"
    }
  ],
  "key": {
    "B": {
      "item": "sophisticatedbackpacks:iron_backpack"
    },
    "G": {
      "item": "minecraft:gold_block"
    },
    "c": {
      "item": "society:gold_upgrade_smithing_template"
    }
  },
  "pattern": [
    "cGc",
    "cBc",
    "ccc"
  ],
  "result": {
    "item": "sophisticatedbackpacks:gold_backpack"
  }
}