How to add autosubdomains to search engines?

Question

Search Engine Optimization

I have subdomains like https://magadan.site.ru/
configured on my site, the user selects a city and then sits with this subdomain on the site every time until he changes the city, everything is stored in a cookie
. So, how do I add such links to Yandex, Google, etc. because there is actually no folder with such a domain, there is an alias *.site.ru and htaccess that substitutes a value, besides adding 4000 cities manually is unrealistic plus confirming somehow?

Answer 1

Surely they have api
And what does it mean to add to search engines, metrics and analytics, and so it will stand up
Webmasters, this is also about something else
In its pure form, if there are links to them, the search engine indexes them