{
    "type": "minecraft:random_patch",
    "config": {
      "tries": 1,
      "xz_spread": 0,
      "y_spread": 0,
      "feature": {
        "feature": {
          "type": "minecraft:block_column",
          "config": {
            "direction": "up",
            "allowed_placement": {
              "type": "minecraft:matching_blocks",
              "blocks": "minecraft:air"
            },
            "prioritize_tip": false,
            "layers": [
              {
                "height": 1,
                "provider": {
                  "type": "minecraft:simple_state_provider",
                  "state": {
                    "Name": "minecraft:netherrack"
                  }
                }
              },
              {
                "height": 1,
                "provider": {
                  "type": "minecraft:simple_state_provider",
                  "state": {
                    "Name": "minecraft:fire"
                  }
                }
              }
            ]
          }
        },
        "placement": [
          {
            "type": "minecraft:random_offset",
            "xz_spread": 0,
            "y_spread": -1
          }
        ]
      }
    }
  }
  