No, I haven't tested yet such a scenario that you mentioned. For me it was not so clear how to configure the setup with internal and external endpoints that you mentioned and how to reuse one backend service from multiple frontend application.
I've just read the chapter 7.3 in the developer cockpit user manual (https://documentation.mindsphere.io/resources/html/developer-cockpit/en-US/index.html). Are your steps related to multiple components described there?
thanks for your question. If I have understood your problem correctly, you basically want to make cross-application calls. Those kind of calls are currently not supported, by we are working on API-type applications.
Any update of support the API-type applications?
is it possibile to use CORS on MindSphere?
If not, is it possibile to create two apps (backend and frontend) and make them "communicate"?
For me there was no way to get two apps working with each other because of the CORS issue. You will have 2 subdomains and this why you will fail because of CORS. Siemens provided no updates since 9 month.