Note: this is not a Chrome question, it's a Google docs question.
How do I import my google.com/bookmarks into the docs folder that is used by Chrome to sync bookmarks?
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One method would be to export your bookmarks from Google Bookmarks. This will generate a bookmarks.html file that can be imported into Google Chrome via the Bookmark Manager. Then if you enable bookmark syncing in Chrome, it should move your bookmarks to the Google Docs Chrome folder. It's a round-about method, but should work.