{
  "type": "minecraft:random_selector",
  "config": {
    "default": {
      "feature": "twilightforest:simple_well",
      "placement": []
    },
    "features": [
      {
        "chance": 0.05,
        "feature": {
          "feature": "twilightforest:fancy_well",
          "placement": []
        }
      }
    ]
  }
}