how to get values of a hierarchy that remain after a filter?

With two three hierarchies for example, "Country" and "City" "Country-City"
On a chart that has measures that don't show any of the three hierarchies (e.g. population by year)

If the filter is set to a certain value for a "Country-City"
e.g. "USA - New York"
Is there a way to iterate through each row  that satisfy the filter and retrieve the City and Country?
 
Data example:
Country, City, Country-City
USA, New York, USA-New York
USA, Washington, USA-Washington
Netherlands, Amsterdam, Netherlands-Amsterdam
 
The hierarchies I would like to retrieve are not shown on the chart or grid so getData would not work.
The reason I want to do this is because I am creating a dashboard and want to set filters for City and Country specific charts to the correct value, in a manner similar to your syncFilter example.
And want to want the user to only need to filter the combination of "Country-City" that have values (i.e. do not want them to filter Country and City independently)
 
I do have a workaround, but it is ugly so it would be nice to know if there is some technique that I am unaware of..

Thank you so much,
 
Stay safe,