Have you checked https://www.jotform.com/help/71-prepopulating-fields-to-your-jotform-via-url-parameters/ ? I don't know the platform, but I guess that should probably work for select fields as well.
https://www.jotform.com/help/1805-what-is-jotform-prefill-and-how-does-it-work/#manual-prefill has more info on how it works.