Nintex Forms - Confirmation Message for Approval Task

Hi

In the Nintex form of an workflow approval task, I would like to add a confirmation message on the submit&save button -

for approve - "You are about to approve this task, are you sure"

for reject - "You are about to reject this task, are you sure" 

 I cannot seem to figure out how I can insert the outcome of the decision in the confirmation message. Named controls are not available to be inserted in the confirmation message box.