Yeah, you can find a "back" camera source by searching the source list, as I suggested. The camera input demo shows you how to access the list.
The actual descriptions of the camera sources are only available after you've already approved permission though. Since remote preview runs on preview.construct.net, if you've ever approved camera on preview.construct.net, you'll be able to access the descriptions. However if you publish to your own website (e.g. example.com), the first time you visit that the descriptions will be anonymised for security reasons.