chromium/chrome/test/data/extensions/manifest_tests/tts_engine_valid_voices.json

{
  "name": "test",
  "manifest_version": 3,
  "version": "1",
  "tts_engine": {
    "voices": [
      {
        "voice_name": "name",
        "lang": "en-US",
        "gender": "female",
        "event_types": [
          "start",
          "end",
          "marker"
        ],
        "other_key": "other_value"
      },
      {
        "voice_name": "name 2",
        "lang": "en-US",
        "event_types": [
          "start",
          "end",
          "marker"
        ],
        "other_key": "other_value"
      }
    ]
  }
}