How to access form data from before a user is authenticated?

So basically, I have a user fill out a form that is then stored in global state. Once they complete the form, they are instructed to login with google to 'complete' their account. I'd like to link this form data to their account somehow but I'm struggling with finding a way to pass this data through the actual authentication process.

Has anyone ran into something similar and how did they get around it? Do I need to store the form data in a cookie or some sort of persisted state, or is there a way to pass data to the middleware and handle it there?
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