How can I add example responses -- (openapi doc) to my swagger doc using drf-yasg package?

Use drf_yasg.openapi.Response--(drf-yasg doc) with the help of @swagger_auto_schema(...)--(drf-yasg doc) decorator as

from drf_yasg.utils import swagger_auto_schema
from drf_yasg import openapi
from rest_framework.response import Response
from rest_framework.views import APIView

response_schema_dict = {
    "200": openapi.Response(
        description="custom 200 description",
        examples={
            "application/json": {
                "200_key1": "200_value_1",
                "200_key2": "200_value_2",
            }
        }
    ),
    "205": openapi.Response(
        description="custom 205 description",
        examples={
            "application/json": {
                "205_key1": "205_value_1",
                "205_key2": "205_value_2",
            }
        }
    ),
}


class MyTestAPIView(APIView):

    @swagger_auto_schema(responses=response_schema_dict)
    def post(self, request, *args, **kwargs):
        return Response({"foo": "bar"})

Schema rendered Result

Update

its keep loading and not showing anything

You may need to click on "Example Value" text if you are looking in Swagger doc