Hi there @heidi, I wanted to reach out to you in regards to leveraging app_metadata to users via email and find out what you desired effect is? Below I have linked a doc that dives into email passwordless authentication that allows you to use a number of parameters. I have included a list of them below but if I am misunderstanding your desired effect please let me know.
Exposed Parameter Description code the password to use link the magic link application.name the name of the application name where the user is signing up request_language the requested language for the message content operation equals change_email when the template is triggered by an update to a user’s email via the API, otherwise null