Today, this only works the way you hope if there's an upstream proxy.
Assuming your environment doesn't have one, this can be simulated via the (cumbersome) process of running two Fiddler instances, one in normal Capturing mode and the other in Viewer mode (File > New Viewer) and using the Composer in the Viewer-mode instance. That Viewer-mode Composer will chain to the "upstream" capturing-mode version of Fiddler, and then you can examine the CONNECT tunnel in that instance.
(FWIW, it's probably possible to get a few of the pieces of data e.g. the selected cipher suite by writing some FiddlerScript. But that approach cannot possibly get the full set of data-- in particular you wouldn't be able to see the cipher list that Fiddler offered.)