cloud foundry inter app communication

I am trying to deploy our solution on SAP cloud foundry. The service consists of frontend and backend services. The frontend services have to communicate directly with the backend services. The backend services on the other hand should not be reachable publicly.

According to the cloud foundry documentation inter app communication can be achieved by using Internal Routes which should expose the special domain "apps.internal".

https://docs.cloudfoundry.org/devguide/deploy-apps/routes-domains.html#internal-routes

This feature does not seem to be available on SAP cloud foundry platform. Can you please advise how to implement inter app communication on SAP cloud platform?