Can approvers of Smartsheet forms be added without giving access to the sheet?

I am creating a form in Smarthsheet that will require two levels of approval is a particular question is answered in a certain way.  In the form they manually enter the email address of the people who are required for approval.  I am finding that if I do not share the sheet with the person I am seeking approval from I cannot simply have them as an approver in a workflow for a form.  This is problematic because there could be a wide array of people who need to approve and I cannot predict who I would need to share this form with.  I also would not want the person submitting the form to see others responses if I give them access to the sheet.  Any help would be appreciated.