How to track external pointing to an object?

Hi! I checked from your doc, that I can track m2m relations defined in the object https://django-simple-history.readthedocs.io/en/latest/historical_model.html#tracking-many-to-many-relationships. 

And what about FK and m2m that are on another models and point to current model with HistoricalRecords field? If you don't support it, can you say any recommendations how to develop this idea? 