You'd need to get nintex forms for office 365 product vs using NAC. I'm pretty sure this isn't possible but id wait for a nintex employee to respond. 

Depending on what you're doing it is possible to display data (using data sources) from a selected item on a form (using a drop down with values of items from a list) and allowing user to edit. Then use workflow to update the item (update items action) in case changes were made.