Is there an option to set a target alarm for respiration?

No.

Thanks for the answer, tmk2, that is a pity. It would be very helpful for breath meditation to have a target breath rate alarm. Is there a watch from Garmin which can do this?

It's funny to read "meditation" and "alarm" in the same sentence...

Well. meditation and alarm fits well together. A good meditator has to be very alert, which requires a respiration alarm.

No Garmin watch can do this? In this way it is difficult for Garmin to sell watches to the the Dalai Lama the 14., Sadhguru, Yogi Bhajan and other meditators. A respiration alarm would eventually be a reason to buy a Garmin watch for those, as well as for us.