The problem is that as they don’t support those fields, there’s a limit to what we can do on our side.
Certainly if you have control of the Google Calendar data you are importing for you could settle on a convention like having descriptions along these lines:
Usual description which will become the imported event description...
Organizer: Joe Schmoe
Categories: Party, Evening, Formal
With some custom dev work (and I’m afraid it’s the sort of task that goes beyond the scope of support offered here on the forums) you could parse the organizer and category data. However, this would certainly be bespoke functionality and it’s unlikely we would roll that into the plugin itself.