This topic was bought up recently (see BIM data in UE 5 connector) and unfortunately the situation is the same. We don’t support any mechanism to access properties on converter Unreal actors.
However, it may be possible access specific properties through a custom converter. We have a tutorial on creating a custom converter, I recommend you check that out. It does require some familiarity with BP and C++.
And for another example, we have a related proof of concept transferring custom “tags” from GH → Unreal.