Is it possible to use user full name instead of username in discussion posts?

I’m using tutor and tutor-forum.
The line “discussion posted {time_ago} by {username}”
Is there anyway to change username to full_name or first_name + " "+ last_name ?
Universities are using student_id@domain as student email format and they use the email as username as well, which make discussion posts look really ugly. Something like “discussion posted 1 minute ago by”.
full_name, first_name, last_name might be null but I think we can have a better solution for this.