Don’t think so, but many of them have the same structure, so after you’ve created a few it becomes faster if you use the Garmin Connect website (not the mobile app), make a copy of similar workout and then adjiust the number of intervals.
I haven’t found a way to do random interals for the 1 minute Fartlek-style run workouts, so I usually set 1 minute on / 1 minute off regular intervals. Anyone tried this CIQ app ? Connect IQ Store | Free Watch Faces and Apps | Garmin