docs: def _from_dict(cls, _dict):
          """Initialize a Voices object from a json dictionary."""
          args = {}
          if 'voices' in _dict:
              args['voices'] = [
                  Voice._from_dict(x) for x in (_dict.get('voices'))
              ]
          else:
              raise ValueError(
                  'Required property \'voices\' not present in Voices JSON')
          return cls(**args)