You can export from https://www.google.com/bookmarks/ because there is an option at the bottom of the list, called "export bookmarks"… but … you cannot import from a list i.e. bookmarks.htm generated from another browser's bookmarks.
How to import bookmarks.htm into Google bookmarks (NOT Chrome bookmarks)
bookmarksgoogle-bookmarksimport
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Best Answer
You can't import bookmarks into the history of alien account if that's what you are asking. All you can do is re-import your exported bookmarks the standard route and then let Google sync it between your browser and your account