I suppose that’s not possible yet. But I have a fervent hope that a full-fledged version will be released soon, as it is on Mac and PC.
By the way, it was already promised in mid-December.
It is possible to export and import lists to an external drive.
You can export a playlist as an M3U. To do this, open a playlist and click the three-dot icon to see the option.
That’s exactly what I did, but don’t forget to link your Audirvana playlists to your account.