I am not quite sure if it is possible with the current ProjectKorra, from my knowledge, you need an event of an ability and It's results.
What I mean is, in Minecraft there are things called events, e.g. When a player toggles sneak, up or down, doesn't matter (We use that a lot for source selecting).
So of course the programmer is able to create his custom event, so one option is to create an event that is triggered when the ability is used. Then we could just take all the information we can, like the user's name, ability's name, etc...