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

[
  {
    "name": "<string>",
    "uuid": "<string>",
    "version": "<string>",
    "download_url": "<string>",
    "bytes": 123,
    "speakers": [
      {
        "speaker": {
          "name": "<string>",
          "speaker_uuid": "<string>",
          "styles": [
            {
              "name": "<string>",
              "id": 123,
              "type": "talk"
            }
          ],
          "version": "<string>",
          "supported_features": {
            "permitted_synthesis_morphing": "ALL"
          }
        },
        "speaker_info": {
          "policy": "<string>",
          "portrait": "<string>",
          "style_infos": [
            {
              "id": 123,
              "icon": "<string>",
              "voice_samples": [
                "<string>"
              ],
              "portrait": "<string>"
            }
          ]
        }
      }
    ]
  }
]