Examples of how to do this can be in C++, .Net, or Delphi, or any language... as I could simply port the code over to my Delphi language.
If this feature is not available, it certainly would be useful. Communication between the application and the javascipt/html is essential for the application to be truly powerful.
There are two ways to communicate with native code in CEF.
The second way is more low-level. You'll have to communicate with the browser process using CEF's IPC mechanism.