Display a Custom Property in the Overview page for all devices

All Zenoss GUI experts,

I would like to have data fields on the overview view for a device show data for a custom property. I have seen https://github.com/cluther/ZenPacks.example.CustomOverview and it is a great intro on how to add device specific attributes, but I want to take advantage to the ability to inherit values and not have to add values to every device individually. How do I change the CustomOverview ZenPack to take a cProperty instead of a regular device attribute Any suggestions

Thanks!

-Ian