Any way to display export value in field after selecting Item Value?

I'm trying to create a form that captures a lot of data, particularly vehicle accident data.  Some of the item values are very long.  What I would like to do is to allow those completing the form to select the Item value from the drop-down box, but populate the form with the export value, which I plan to have as numerical.  So if we have item values of Apple, Banana, and Cookie, with corresponding export values of 1, 2, 3, when the user selected Banana, the form would display 2.  Can that be done?  Any help would be appreciated.  Thank you.