How to input a diminished7 (maj7) chord?

[Andrew Zah]

Hi,

I'm trying to input a Bbdim7(maj7) chord. See the attached for an example.

Currently I'm doing this to override chords:

jazzChordDefinitions={
  % ...
  <c ees ges>-\markup { \super "o" }
  <c ees ges beses b>-\markup { \super "o7(△7)" }
  % ...
}

and then
jazzChordExceptions=#(append
    (sequential-music-to-chord-exceptions jazzChordDefinitions #t)
)

\chordmode {
  \set chordNameExceptions = #jazzChordExceptions
  % bes2.:dim7.maj7 ??
}

How would I input that chord in chordmode?

Thanks,
Andrew