Create a button on panel using your Google Bookmarks inside. You can access and manage it. Also you can add new to Google Bookmarks.
Google used labels for manage bookmarks. This extension presents labels as folders. Nested folders is a simple label with "nested folder separator" (you can set this at options page). Then you set new label to bookmark you create new folder.
Use right button context menu for edit or remove bookmarks.
Note: Extension have access to tabs opened after installation