{
  "type": "minecraft:delta_feature",
  "contents": "minecraft:lava",
  "rim": "minecraft:magma_block",
  "rim_size": {
    "type": "minecraft:uniform",
    "max_inclusive": 2,
    "min_inclusive": 0
  },
  "size": {
    "type": "minecraft:uniform",
    "max_inclusive": 7,
    "min_inclusive": 3
  }
}