There's no way to cleanly do it between hassio and core due to the add-ons vs integrations thing. If you're just worried about entities, and don't mind a bit of manual work to cleanup on the other side of things, just copy the entire home assistant directory from the host machine.
I’d say it’s not that trivial and makes you the maintainer of your add-ons. Of course it gives you more flexibility, but you do have to manage them/update yourself.