Custom password/reset service

I can’t figure out how to “simply call” or specify the template used by the user/password?reset api other than changing it via the Admin UI, can someone please give me an example of how to do it?

Same for passing in values for the reply_to_email field, is there anyway to set it dynamically in the reset function?

I have tried passing in the template name as shown in examples for the email service, and values for reply_to_email, but nothing works.