OTP verification and form changes

I have set up OTP, so that I can ensure verification of email. I want to know if it is possible to change the form where the user creates their password (final step). My use case is that, on that form, I want to add a checkbox (sign up to our newsletter) that then uses action to post data to my service provider

I can do that with a custom form, but not with the OTP approach. Is my assumption correct?

Thanks

Grant

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