Multiple models in Django Rest Framework?

I am using Django Rest Framework . I want to serialize multiple models and send as response. Currently, only one model can be sent per view (as CartViewshown below, only Cart objects are sent). The following models (unrelated) can be there.

class Ship_address(models.Model):
   ...

class Bill_address(models.Model):
   ...

class Cart(models.Model):
   ...

class Giftwrap(models.Model):
   ...

I tried using DjangoRestMultiplemodels and it works fine with some limitations. Is there a built-in method? Can't I append to the serializer created in the following view?

from rest_framework.views import APIView

class CartView(APIView):
    """
    Returns the Details of the cart
    """

    def get(self, request, format=None, **kwargs):
        cart = get_cart(request)
        serializer = CartSerializer(cart)
        # Can't I append anything to serializer class like below ??
        # serializer.append(anotherserialzed_object) ??
        return Response(serializer.data)

I really like DRF. But this use case (sending multiple objects) makes me wonder if writing a simple old Django view would be better suited for this need.