DjangoFilterBackend for TAGS on products (separate apps)

I am working on the Django Part 2 series that covers filter queries. I was wondering how to implement filtering products by TAGS. Given that tags and store are separate apps, the Serializer and ViewSet should not go in the Store app. This action should be separate. I’m guessing it would go in the core app and you would have to create a separate and… Does anyone know how this would work?