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is this what you are after?
Comparative Analysis - Alternate States with Qlik Sense
Using your Inline code I can see and select the City values. Not sure what problem you facing?
Check your Data model and it's association with other tables.
I've tried it, but it's still wrong.
Expression for Country:
Expression for City:
I select the "A" in "Country", and then "a1", "a2", "a3" in "City" will be automatically selected, and the two filters will be automatically hidden.