code: def create_metadata(self, **params):
          
          params = json.dumps(params)
          return self.post("https://upload.twitter.com/1.1/media/metadata/create.json", params=params)
docs: Adds metadata to a media element, such as image descriptions for visually impaired.
  
          Docs:
          https://developer.twitter.com/en/docs/media/upload-media/api-reference/post-media-metadata-create