I’m afraid not. We are currently working on similar disc-tabs in CLZ Movies Web where we will make the “disc tab” at the top also show whatever you fill in the “Disc-Title” field. So in this case it would show “Seite 1” - we’re thinking of bringing that change to CLZ Music Web too.
Have you ever tried working with “Headers” and put the tracks inside the headers?
You could name the Header “seite 1” and put the tracks of seite 1 “inside” that header.