{
    "type": "advancement_reward",
    "pools": [
      {
        "rolls": 1,
        "entries": [
          {
            "type": "item",
            "name": "patchouli:guide_book",
            "functions": [
              {
                "function": "set_nbt",
                "tag": "{\"patchouli:book\": \"patchouli:atlas_guidebook\"}"
              }
            ]
          }
        ]
      }
    ]
  }