City-Country search bar (open data)

Hi, I’d like to create 1 entry zone where users start to type a city, and some propositions are made (including the country), with 1 to be selected.

I have several questions:
1- which opendata site would you recommend?
2- in theory should it be an “inline list select”? if yes, how deal with it without loading the whole database (thousands of lines)?

Thank you in advance

Not sure how this would be possible without an API column…

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Thanks @ThinhDinh.
I was wondering if there were something to do with webhook, zappier & all their friends… but quite (very) far away from my skills