Not available in the Garmin Connect interface, but you can exchange directly the FIT files from device to device. Use the USB cable to download the workout from the folder //GARMIN/Workouts and have your counterpart putting it into the same folder on their watch.
... as I wrote, it is not available in Garmin Connect. You have to connect your watch to a computer with the USB cable, and access the storage of the watch directly (i.e. with File Explorer in Windows, or Finder in MacOS)