Dear Forum Experts!

I apologize if my beginner's question was answered earlier - but even after some searching in the forum I could not find a suitable solution so far:

I am running Asset UPnP Version: R7.2 [Linux-x64]; Functionality: Premium Registered on a Synology DS720+ with DSM 7.
My player is a naim ND5 XS 2, iOS naim app.
My audio data are mostly FLAC and ALAC files, my CDs were ripped with dBpoweramp CD Ripper, downloaded High-Res files were edited with perfectTUNES (ID Tags), I entered the recording Label in the corresponding "Label" field.

I'd like to add a menu item to sort Albums by the Recording Label and could not figure out how to do this. Probably I would have to edit the Browse Tree as plain text and add something there - or wohld have to do something else...

Any help would be greatly appreciated!