Different font sizes on 1 staff
So I'm doing the full score of Mozart's Coronation Mass and the Alto, Tenor, and Bass trombones play colla parte with the Alto, Tenor, and Bass, respectively. I'd like it to show "Alto" in a bigger font size and "Trombone Alto coll' Alto" in a smaller one, but I don't know how I can do it. Some guy did Bach's Magnificat with this same technique, where "Violini" was written in a bigger font and "all' unisono" in a smaller one. How can I do it? Can I even do it?