Help retreiving COMBAT_LOG info

[Ledii]

Hi. Whenever I receive an event from COMBAT_LOG_EVENT I would like to obtain the level of the sourceGUID / sourceName.
I know I can obtain this information from my current target. But I need it to work without manual targeting involved.
I'm collecting statistics on how much damage each individual enemy dealt to you during the fight.
Is this possible in any way what so ever?

The most intuitive way I could think of doing this would ofc. be UnitLevel(sourceGUID / sourceName).
But from what I found through my research that is not allowed for what ever messed up reason.

If I cast spells myself, I could always cache my target and assume my next hit on the same GUID is the target info I just had. But if a random extra enemy enters mid-fight, I want to be able to get at least the name and level from that enemy. But preferably things like UnitCreatureType as well for aesthetic reasons.

Any suggestions here?