How to mount btrfs subvolumes so that they show up under "Devices"?

So I have a luks encrypted btrfs partition labeled Media with two subvolumes

Media
  @media
  @music

Both are mounted via fstab, no problem on the functional front. @music goes to ~/Music, but how do you make @media show up under Devices in Dolphin and the KDE file-picker?

All I get is this:

https://i.imgur.com/oqLzf8X.png

which has the Media partition-label but points to ~/Music. I can add the mount point for @media to Places, but Devices would be nice to have.