Security - step up authentication

Technical Questions
1

Given a user that authenticates through Auth0 (or whatever), how would I do a ‘step up’ authentication for specific actions (starting a request on a Page to get money from your bank account)?
This is usually a call back to Auth0 using a different acr_value to do a different level of authentication, but how do we initiate this in an Apex App?
FYI, configuration on the auth0 side: Configure Step-up Authentication for Web Apps