Hi @marosko89 — Good question.
There’s a (long-standing) open ticket for that as it happens:
https://code.djangoproject.com/ticket/7835
The solution I use is @charettes’ suggestion in comment:46 there. This works well, so 
@adamchainz brought up similar, with reference to documenting the internal @isolate_apps decorator (ticket) (linked example usage)
Either of those should get you going. Would be interested to see what you settle on.
HTH.
Carlton