Not sure if you solved this, it’s kinda old, but you can take the XML file into Excel, and convert it to a CSV file.
Also the ZIP file has the CSV file, which you can open into excel, if its not importing correctly to BitWarden, just re-arrange it in excel to import the data correctly. I had to do this to get it to import correctly.
Make sure the CSV File is in the correct order when editing. View bottom.