chord labeling

[Edward Sanford Sutton, III]

  I know a chord can be labeled as Cm, but is there a way to label them for 
harmonic analysis? I have only figured out how to get so far with stuff like:

<c e g>_\markup "i"

The last time I attempted such markings was on a cadential I 6/4 chord. I 
found that using \column in a markup statement was about as far as I was 
getting (which would still need work). In any case, a number of other needed 
notations are beyond my ability to figure out with my current lilypond 
knowledge. I usually glance at the chord names section of the manual, thus 
remembering that it isn't discussed there; maybe I thought I found a way to 
get what I want a while back in lilypond's manual.
  I don't expect lilypond to determine the analysis itself, but this would be 
a nice addition to figured bass if it isn't currently possible.
  On that, is there a reason why '/' hasn't been supported in figured bass? I 
thought that the figured bass engraver was basically just engraving markups. 
Is is also interacting with the music for anything besides spacing? The only 
differences I see in handling "/" versus the other accidental markings is 
that it's meaning could not be processed without analyzing the bass note and 
also possibly that the "/" tries to get processed by a programming language, 
like "\" as an escape sequence.
  Is there somewhere besides the bugs section of the corresponding lilypond 
page that explains such problems better? I didn't notice anything sticking 
out at me within the source yet.
  I can't seem to get a handle on lilypond code yet; I haven't programmed in 
too long and have too little time to make a lot of good sense of any source 
file I have opened yet.
Thanks,
Ed Sutton