Is it possible to add new recipients to  a workflow task that has already been assigned to others. We have a K2 Form where a user enters a list of names and email addresses. When the submit button is clicked a workflow task is assigned to the people defined in the list.

Sometimes the user realizes that they forgot to include a  required name/email address to the list before the workflow was submitted. We would like to add the name/email address after the workflow has already been submitted and ensure that the new recipient/s also gets the task notification. We would like to do this without using roles. 

Is there a smartobject method or another way of doing this.