code: def unformat_geojson(self, feature):
          
          attrs = feature["properties"]
  
          if 'geometry' in feature:
              attrs[self.Meta.geo_field] = feature['geometry']
  
          if self.Meta.bbox_geo_field and 'bbox' in feature:
              attrs[self.Meta.bbox_geo_field] = Polygon.from_bbox(feature['bbox'])
  
          return attrs
docs: This function should return a dictionary containing keys which maps
          to serializer fields.
  
          Remember that GeoJSON contains a key "properties" which contains the
          feature metadata. This should be flattened to make sure this
          metadata is stored in the right serializer fields.
  
          :param feature: The dictionary containing the feature data directly
                          from the GeoJSON data.
          :return: A new dictionary which maps the GeoJSON values to
                   serializer fields