I'm not sure if it's supported or not. Could not find any documentation.
It would be helpful if libnetwork could pass arbitrary labels from users (e.g. 'docker run' cli or api ) to the current remote driver (based on selected network mode).
I tried to specify my own labels (with some of the prefixes defined in libnetwork), but couldn't see any of them passed through.
If this feature already exists, please point me to the documentation/example and feel free to close the ticket.