Overworld

{
  "biome": "minecraft:plains",
  "lakes": true,
  "features": true,
  "decoration": false,
  "layers": [
    {
      "block": "minecraft:bedrock",
      "height": 1
    },
    {
      "block": "minecraft:stone",
      "height": 59
    },
    {
      "block": "minecraft:dirt",
      "height": 3
    },
    {
      "block": "minecraft:grass_block",
      "height": 1
    }
  ],
  "structure_overrides": [
    "minecraft:mineshafts",
    "minecraft:pillager_outposts",
    "minecraft:ruined_portals",
    "minecraft:strongholds",
    "minecraft:villages"
  ]
}