Unfortunately that is not part of the current theme functionality, and it’s not within the scope of our support to be able to provide that functionality as it is more work than a small customisation. While we’d love to be able to support every customisation request, we simply don’t have the time. We recommend that you seek a freelance developer if you need that functionality, potentially from one of the below resources:
https://codeable.io
Home
http://www.microlancer.com
Hope that helps.
– Kyle