minecraft-bedrock-json-schemas/examples/bp/feature_rules/aggregate_feature_placement.json

{
  "format_version": "1.13.0",

  "minecraft:feature_rules": {
    "description": {
      "identifier": "aggregate_features:aggregate_feature_placement",
      "places_feature": "aggregate_features:aggregate_feature"
    },

    "conditions": {
      "placement_pass": "final_pass"
    },

    "distribution": {
      "iterations": 1,

      "x": 0,
      "z": 0,
      "y": 90
    }
  }
}