docs: def _from_dict(cls, _dict):
          """Initialize a QueryEvidence object from a json dictionary."""
          args = {}
          if 'document_id' in _dict:
              args['document_id'] = _dict.get('document_id')
          if 'field' in _dict:
              args['field'] = _dict.get('field')
          if 'start_offset' in _dict:
              args['start_offset'] = _dict.get('start_offset')
          if 'end_offset' in _dict:
              args['end_offset'] = _dict.get('end_offset')
          if 'entities' in _dict:
              args['entities'] = [
                  QueryEvidenceEntity._from_dict(x)
                  for x in (_dict.get('entities'))
              ]
          return cls(**args)