ability to reject an approval request

The current MPA workflow allows anyone in the list to approve, however there was a question to be able to add a button in the email, to deny the request too. Without knowing the level of effort on this feature add, I could imagine a subset of the recipients being named in a list maybe `POSSIBLE_APPROVAL_DENIERS=eng.managers@domain.com` (terrible var name perhaps, apologies), and as long as that is a nested group within the group of engineering@domain.com eligible for JIT roles, their email would include a red deny button?