WTH Can't variables be pushed to Script Blueprints like they can with Bare Scripts?

Scripts can start with variables that are sent as data from an automation. However Script Blueprints do not accept this data, or at least I have not found it in the documentation or have I been able to figure out how to do it.
Plugging “live” data is a fantastic feature of scripts, and I dearly miss that in Script blueprints.

Probably can consider this closed with script fields?