This is a mess since Google Chrome doesn’t have any utility to manage its bookmarks to online Google Bookmarks. It is also an irony since both of them are Google’s. Here is the only way to have your Chrome bookmarks into Google Bookmark.
Click Costumize and control Google Chrome icon and then click Bookmark Manager. If you want to make it fast just type chrome://bookmarks then push enter.
After the bookmark page appeared, click Organize and then choose Import bookmark. It will save all your bookmarks to an HTML file. Note: In some case you’ll need to rename the file to have an .html extension.
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