Getting back with the news. So unfortunately for now Auth0js needs a new method to patch the root attributes. There’s no ETA for that as of now but I’ll create an issue on GitHub that you will be able to observe regarding that. I’'ll post the link you can follow in a few moments!
The repo maintainer is on vacation right now but once he’s back he will work on that. It will be great if you can also let other community developers here know once the feature is there after you’ll close the issue together!