Add "Country" to FORM settings in Pages

In Form Settings, in Pages... where you select where to send contacts after they submit (such as sending them to a thank you page after they buy).... there is a "Conditional Redirect" section. Awesome. Except, it only has a few field options. Adding "Country" could allow me to make different upsell offers to people in different countries... which can matter if it's something I can't ship to another country. Can you add that field? Thanks!