Hi @MichaelMannucci, the built in lightbox does not provide a way to use additional custom elements yet, however you can create a custom lightbox and achieve this feature:
http://help.webflow.com/faq/how-to-make-a-custom-lightbox-with-webflow-interactions
Also, this tutorial article may also help: [Tutorial] How to create a modal/pop-up in Webflow - Webflow Tips - Forum | Webflow
I hope this helps! If not, share the link to your site and I am happy to take a look: Share a read-only link | Webflow University
Thanks in advance!