(1) I've set up Edge Dev on three computers so far. In each case, during the setup process I'm offered the option of importing my Edge Classic bookmarks, but given no other options. It would be a good idea to offer a range of import options at this point (Edge, Firefox, Chrome, HTML file).
(2) After setup, Edge Dev (Favorites, Import) offers the option to import from Edge, IE, Firefox and Favorites/Bookmarks HTML File, but not from Chrome. If MS is hoping to bring Chrome users over to Edge Chromium, might be a good idea to add the option to add Chrome to the import options.