I am also wondering this same thing. I would like to have some kind of laminated label, such as a Brother P-Touch label, and use a PC connectable printer. However I want to make sure that this would be supported and work before purchasing.
For our assets we are using pre-made stickers with our logo along with a simple Code-128 barcode. This works perfectly through the “Scan & add” function within the mobile app.
Along with that you could take a look at the app within the system itself, found under Admin > Helpdesk Productivity > Apps. It's called “Asset Label Designer”. It can generate a barcode of your likings which is compatible with the Asset Manager.