Add the ability to print on the upper, inside panel of folded 4x6 cards in Create & Print

I had a client request a folded 4x6 card in which he wanted to preprint a letter using both the upper and lower sections as text boxes.  We offer the option to put a photograph on the upper, inside panel, or leave it blank, but there is no option for a text box in that location.  Could this be added as an option? Thank you.