Can I add individual item in the “Sandclock tree for a Families”, for example City and State?
Your request is a little confusing. You use the term “add” but the report already prints the place information.
You can create the display option, set it when you want to run the report, then change back to your normal display. Attached is what I use when all I want is the City, State stripping out everything else. This may not work for all places depending on how many levels you have in the hierarchy. Mine was configured to work on my places in the U.S.
A new place format editor is planned for the next release of Gramps (5.2). Unfortunately the current one is pretty limited.