Hello @samuel and welcome to the forum!
I don’t know of a way to do this now. There are periodically feature requests to do something like this to give CrashPlan users more info and/or options for available files, instead of restoring the latest from the backup.
When I hear “full file summery” I’m not sure which part to focus on. Is this a browser UI feature like the above, or some static web page, or a printable report (width might become an issue), or something else? To roughly approximate what’s backed up could perhaps be done using other tools that are run by the Scripting options.
Date information is definitely there, but I’m not sure if there’s any UI to show it. This date is a UNIX timestamp.