Have you investigated what Label properties are available, i.e., start with the Panel Name Annotation, edit the family to add more labels, and modify the labels' properties to show different information.
I think your thought method is correct, but in only spending a couple of minutes with it, I ran into the following:
With a panel:
You can label its voltage
I'm not sure what Sector means
For Instance #, you may use Mark
Floor/Use/Building - These aren't native family properties, and as such, I am not sure if you could label components with such information.
FWIW,
MS
Martin Schmid
Product Line Manager
Mechanical Detailing and Electrical Design
Architecture, Engineering, and Construction
Autodesk, Inc.