Using GeoIP Location in Display logic Qualtrics - geolocation

I have a question regarding appropriate use of the GeoIP Location in Qualtrics as part of display logic.
I wish to restrict the display of one question only to participants from London, England. I have looked at the support page regarding this topic. However, there is no further help about what values are accepted in specific fields available in GeoIP location. I have simply typed in "London" (see image below); however, they could also require coordinates or other values.
Could you please advise how to set up the display logic with GeoIP Location only to London, England?
Is it possible to restrict the GeoIP even further only to certain London Burrough for example? Can you please provide an example?
Is it possible to restrict the GeoIP location to a polygon coordinates? For example, I will set up the polygon using map polygon tool. Is it possible then restrict the display logic only to GeoIPs only within the polygon? Can you please provide an example?
Thank you for any help.

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