Multi-Value AJAX Cascading Dropdowns

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Hi. It’s very informative, but in the video explanation unable read it completely. I have a similar usecase to auto populate city-state-country values by making an ajax call to city-list api from the frontend enrollment form after user enter a postal code. We have to populate city, state and country if there is a single response. If the Google api provides multiple city and countries for same zip code, we should populate those city and country in the dropdown, state will be auto populate based the city selected by a user.
Any helpful ajax snippet references and thoughts on this scenario ?

DG-cdjb