Include data from sign-in page with an OAuth provider

[aleehedl]

Let's say I have a sign-in page where I have a form where I can make a choice which would be used when creating the session JWT. When using credentials flow (for instance, email & password), I can take the value directly from the request data. But when using OAuth, the original request data is lost after the redirections.

I guess the state object could be used to include arbitrary data through the authorization process, but as far as I know, next-auth doesn't support adding own data to it. Is there any other way around it?