Service Catalog: Dynamic Approvers List in Workflow

Service Catalog: Dynamic Approvers List in Workflow

Hi!
 
Hopefully, this has not already been asked.  I have created a new "resource" field in a Service Request form called "Manager E-mail Address".  Is there anyway to use whatever the requester enters into this field as the Approver in the Workflow? I know right now, you have to preset the Approver list but as different requesters have different Managers, we can't use a pre-defined list (and of course, we don't want to send to all Managers for approval for one requester).
 
Thoughts/suggestions?
 
Thanks.

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