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My understanding (which I warm is basic at best) is that it's not an athlete level chart. Therefore only shows up under workouts.
You can obviously compare VAM between different workouts workouts, so that way you can compare how you've done on the same climb on different dates. I don't see how you can measure VAM over time in any other way though, as it's so dependent on conditions (climb length/gradient/etc). Sorry if I'm misunderstanding though.
Do you know about the WKO4 power group on Facebook? It's a great resource.
(And there doesn't seem to be one other than the one you can attach to an activity)