How to include customCardProps in JSON - For Hover Formating

Hi, 

I saw an interesting formating view in microsoft site 

https://docs.microsoft.com/en-us/sharepoint/dev/declarative-customization/column-formatting

But there if I copy the JSON and apply to a List it apeears the message bellow : 

"Define your formatter options inside the customCarProps/formatter property"

But inb the same site its not clear how to do that definition.  It mentions this "This example uses customCardProps, openOnEvent, directionalHint and isBeakVisible"

But cant find out how to include this in the JSON or list, is there a more detailled instruction?

Thanks!