You can create an event category if you want to track it and just create a new topic each time you assign experience. When you reveal it, as long as you are tracking the sessions reveal history, it'll be tracked that way. You won't have a total, but if your players are using Herolab, they should be able to add it in as necessary. You can even add in the actual in-game date they received it.
This may also be a function in the Journal feature that has yet to be finalized.
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