I was setting up GeoIP rules (https://nginx.org/en/docs/http/ngx_http_geoip_module.html) and looked into the MaxMind database when I realized there are multiple cities that has the same name. This means I can't simply match $geoip_city in a rule. The only data that's unique and is available for all cities in the world is the "geoname ID" (https://www.geonames.org/). However, it seems I can't use that field even if it's available in the database file. Also, I don't want to complicate the code with different approaches for different countries (e.g., metro code/DMA region code is only available in the US).
Is there any way I can use that unique ID to identify a specific city in the Nginx configuration?
If there isn't, what would be the best implementation to avoid multiple conditionals? Using the module already eats up memory and I'd like to provide the best experience for the websites.

Examples:
Clinton - 28 cities in the US (naturally all in different states)
Aalst - 2 cities in Belgium (in two different provinces)
Acailandia - 2 cities in Brazil (in two different "subdivision")
...
version: nginx/1.21.3

Thank you,
YvorL