minecraft-bedrock-json-schemas/source/behavior/blocks/format/events/play_sound.json

{
  "$id": "blockception.minecraft.behavior.block.events.playsound",
  "type": "object",
  "description": "Play a sound relative to target position.",
  "title": "Playsound",
  "additionalProperties": false,
  "properties": {
    "sound": { "type": "string", "default": "", "description": "The name of the sound to play.", "title": "Sound" },
    "target": { "type": "object", "default": "self", "description": "The target context to execute against.", "title": "Target" }
  }
}