{
  "feature": "minecraft:glowstone_extra",
  "placement": [
        {
      "type": "count",
      "count": 2
    },
    {
      "count": 10,
      "type": "minecraft:count"
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "height": {
        "min_inclusive": {
          "above_bottom": 0
        },
        "max_inclusive": {
          "below_top": 0
        },
        "type": "minecraft:uniform"
      },
      "type": "minecraft:height_range"
    },
    {
      "type": "minecraft:biome"
    }
  ]
}