{
    "feature": "mining_dimension:frozen_caves/slush_patch_ceiling",
    "placement": [
      {
        "type": "minecraft:count",
        "count": 50
      },
      {
        "type": "minecraft:in_square"
      },
      {
        "type": "minecraft:height_range",
        "height": {
          "type": "minecraft:uniform",
          "min_inclusive": {
            "absolute": 0
          },
          "max_inclusive": {
            "absolute": 256
          }
        }
      }
    ]
  }
  