Apnea dives on Snorkel activity?

Usually when snorkeling I tend to do some apnea dives.
I've tried to add descent data on a new screen on the activity so I can check it underwater, but it seems that it's not available?
Since the apnea activity is lacking the more or less a accurate heat map zones and only shows the point of inmersión, it is not suitable...
Actually a combination of both would be great...
Any idea in how to at least bring the descent data into the snorkeling activity?
Thanks everyone!