When exploring the diatonic chord progression for a particular key, is it possible to display them on a treble clef instead of the piano keyboard display?
Welcome to the forum. I agree it would be helpful to have an option to display the chords as musical notation, but the treble clef may not always be the appropriate clef: it depends on the voicing and pitch of the chords.
If you want to achieve this at no cost if you install MuseScore (free) you can export midi from Scaler and import it into MuseScore. You can even drag and drop the chords from Section C directly onto MuseScore.