How to get nearest cities using google maps api?

Question

JavaScript

The task is to get all cities within a radius of 50km from a given point using google maps js api
1) search for places nearby, nearbySearch - when specifying types: ['locality', 'administrative_area_level_3'] - returns only 2 cities for each request, but you need to get ALL cities within the radius. I didn't find anything about it in the doc.
if you do not specify the type and parse the answer yourself - a maximum of 60 places come up, which may not include all cities.
2) bulk search, radarSearch - you cannot specify a city type, 200 places come up, which again may not include cities, and for each place you need to send a request with its place_id to determine whether it is a city or not - this is too expensive
3) I made a lot of marks, placed them along the boundaries of the map viewport and at some distance, I check each by geocoding whether it is in the city or not - again a problem - Google does not allow geocoding more than 5 points, only with breaks of 2 seconds, this does not fit,
tell me what else is possible try

Answer 1

Quote from Wikipedia:
You can simply collect all the necessary attributes for all cities of the Russian Federation and find the nearest one without any API of any maps.