curl --request POST \
  --url 'https://api.example.com/api/v1/voice/custom_voice?api_key=' \
  --header 'Content-Type: multipart/form-data' \
  --form custom_voice_file='@example-file'

{
  "message": "Data created successfully",
  "meta": {},
  "data": {
    "name": "<string>",
    "description": "<string>"
  }
}