Creating a Centroid in Django GeoDjango returning as GeoJson with object attributes

django-centroid.py

import json
from geojson import Feature
from django.contrib.gis.db.models.functions import Centroid, AsGeoJSON
from buildings.models import Space

from rest_framework.decorators import api_view
from rest_framework.response import Response

@api_view(['GET'])
def get_room_center(request, unique_id):
    space_qs = Space.objects.filter(external_id=unique_id)
    att = space_qs.values()[0]
    # do NOT include the original polygon geometry, so set it to None
    if att['multi_poly']:
        att['multi_poly'] = None
        
    centroid_result = Space.objects.annotate(json=AsGeoJSON(Centroid('multi_poly'))).get(external_id=unique_id).json
    res = Feature(geometry=json.loads(centroid_result), properties=att)
    # or
    # res = Feature(geometry=json.loads(space_qs.multi_poly.centroid.geojson), properties=att)

    return Response(res)