Hi Sim,
Attributes can be added to primitives, nodes, and graphs themselves with the “add attribute” node. Unfortunately, these attributes do not (yet) survive the flow into SketchUp itself and thus cannot be reported.
I may have made it sound like attributes were an immediate SketchUp reporting option in the bounding box thread which isn’t the case.
The more demand we have for Attributes/Reporting, the more we can prioritise it over other features/refinements. I’m keen to hear your thoughts (and others) on how high this rates over other features/fixes.