@minecraft/creator-tools/data/content/newitemjson/cave_carver_feature.json

Minecraft Creator Tools command line and libraries.

{
  "format_version": "1.21.80",
  "minecraft:aggregate_feature": {
    "description": {
      "identifier": "examplens:examplename"
    },
    "features": ["examplens:targetname"]
  }
}