curl --request GET \
  --url https://api.example.com/engine_manifest

{
  "manifest_version": "<string>",
  "name": "<string>",
  "brand_name": "<string>",
  "uuid": "<string>",
  "url": "<string>",
  "icon": "<string>",
  "default_sampling_rate": 123,
  "frame_rate": 123,
  "terms_of_service": "<string>",
  "update_infos": [
    {
      "version": "<string>",
      "descriptions": [
        "<string>"
      ],
      "contributors": [
        "<string>"
      ]
    }
  ],
  "dependency_licenses": [
    {
      "name": "<string>",
      "text": "<string>",
      "version": "<string>",
      "license": "<string>"
    }
  ],
  "supported_features": {
    "adjust_mora_pitch": true,
    "adjust_phoneme_length": true,
    "adjust_speed_scale": true,
    "adjust_pitch_scale": true,
    "adjust_intonation_scale": true,
    "adjust_volume_scale": true,
    "interrogative_upspeak": true,
    "synthesis_morphing": true,
    "adjust_pause_length": true,
    "sing": true,
    "manage_library": true,
    "return_resource_url": true,
    "apply_katakana_english": true
  },
  "supported_vvlib_manifest_version": "<string>"
}