Maybe try a bookmarks manager extension. With Neater Bookmarks, the Chrome extension,
https://chrome.google.com/webstore/detail/neater-bookmarks/ofgjggbjanlhbgaemjbkiegeebmccifi?hl=en
You can have folders within folders within folders. If you import into the Bookmarks bar, with that extension, you may be able to have the setup you are used to. It's the bookmarks manager extension I use, and I like it. It helped me do the importing of my Opera 12 bookmarks. To use a Chrome extension, all you need is to have the Opera extension, "Download chrome Extension." https://chrome.google.com/webstore/detail/neater-bookmarks/ofgjggbjanlhbgaemjbkiegeebmccifi?hl=en