Right now you may export them through CSV or VCard.
If you want to export them one by one, you may do that through VCard (the new 1.7.1 version, which is coming out soon, has a new feature which will let you export all contacts through VCard though). Otherwise, if you want to export every contact you see in that Workspace, you can do that through CSV exportation.
Regarding importation, you will import every contact contained in the file you are using
Greetings!