Usually rolands don't have it I think and if there isn't a way from factory it's still doable.
Just take any light or spot that it shows it's done and add a small logic and beeper to it. If nothing else, small microswitch to the home position and let's say it sits there for 10 sec, it can be considered as done and start beeping. Button to reset it, maybe also another signal from the pincwheel sensor etc etc. Maybe one of those smart lamps on top of it and make it blink disco red or whatever...
Small fun weekend project