No, its not possible.
the CC mapping is used to generate code (done in Java), so the board has no knowledge of this mapping.
note: parameter mapping is changing in the next version, I'm not sure if this may or may not alter for that release... I'll take a look when I start looking at it in September.
What are you trying to achieve? perhaps there is a different way to achieve the result you are after?
generally, I don't use CC mapping, I prefer to do the mapping within the patch, so either
a) map midi/in/cc to inlets
b) map midi/in/cc to modsource, then use modsource to parameter
(a) is my preferred route, but sometimes there are not inlets where I need them, and if I'm too lazy to create an object variant, I use (b)
if I want to get really flexible I'll use midi/in/cc any ... and which allows changing of the CC mapping to parameter mapping dynamically. quite handy if you want to use 'modes' , say 4 CC which depending on mode change different parameters.
one of the reasons, I prefer this route (over midi CC assign) is that it makes adding support for gpio/in/analog (e.g. for my axocontrol) to my patches trivial