GraphHopper and Postgres

Hi, I am developing a routing application with turn by turn navigation in JAVA. I need to use GraphHopper routing and navigation. But I need to use my own postgres database instead of .osm or .pbf file, is there a way I can do that? Can I integrate postgres with GraphHopper JAVA API?

There is no custom import for this yet but would be interesting.

The opposite way is already possible:

I gave same problem as you have,
Do you have any suggestion to use postgres instead of osm or pbf?

Best Regards