Mark an object that doesn't have a nameplate?

[monkydudy]

I was trying to create a shitty weakaura that automatically marks certain enemies or allies. Which is easy enough thanks to SetRaidTarget and some nameplate cycling to get the unitId.

But, how can you get the unitId of an object that does not have a nameplate?

(for context, I'm trying to put markers on the relics in the Crucible of Storms raid)