Possible answer, why it would be dificult: https://wordpress.stackexchange.com/questions/151501/can-username-and-password-be-passed-to-wp-login-page-in-an-iframe
This renders just as text:
https://aumprakse.typeform.com/to/mmRMxF?name=[user_display]&email=[user_email]
This renders as div:
powered by Typeform