@valerymartyshko It seems here. Although not sure if this is suitable for your case.
https://hetmanrecovery.com/recovery_news/how-to-recover-google-chrome-bookmarks-history.htm#id4
Latest posts made by valerymartyshko
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RE: Bookmarks gone?Opera for Windows
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RE: Bookmarks gone?Opera for Windows
If synchronization was not enabled in your browser, then really, nothing will automatically restored. You should to create a backup of your browser data before.
But, all browser data is stored in its data files. Theoretically, if you substitute them from one browser to another, the browser will see them and download them.
Somehow I read about it on the example of Chrome and Mozilla.