Eventually, after a fix of my car equipment I was able to run Android Auto in a separate profile with Sandboxed Google Services.
On my phone I installed Magic Earth and Here we go and I selected them also in the "Car" profile. They work fine on the smartphone, but they are not shown in AA. In the settings I cannot find them as available app to add. Is there anything I must set to make them available?
Telegram (Forkgram) is available, but when I select it from AA it just shows a loading spinner.
Last question: Google Play says I have to update AA from the store (instead of using the GrapheneOS version). It says it will be mandatory soon. Is it safe or it will break the compatibility?