definitions/features/nether_cave_carver_feature.json

{
  "format_version": "1.16.100",
  "minecraft:nether_cave_carver_feature": {
    "description": {
      "identifier": "minecraft:nether_cave_carver_feature"
    },
    "fill_with": "minecraft:air",
    "width_modifier": 0.0,
    "skip_carve_chance": 5,
    "y_scale": [ 0.5, 0.5 ],
    "height_limit": 120,
    "horizontal_radius_multiplier": [ 1.0, 1.0 ],
    "vertical_radius_multiplier": [ 1.0, 1.0 ],
    "floor_level": [ -0.7, -0.7 ]
  }
}