Chord Names Between Piano Staff Treble and Bass Clefs

[keith Luke]

I have:

Melody = \new PianoStaff 

<<
     \new Staff { \clef treble  ...right hand notes...}

     \new Staff { \clef bass ...left hand notes...}
>>

harmonies = { \chordmode { ...chord names...}

\score {
<<
\new ChordNames {\harmonies}
\Melody
>>

I can place the chord names above the treble clef, but would like to place them between the clefs.

How do I put chord names between the treble and bass clef parts in \new Piano Staff instead above the treble clef part?

Thanks,

Keith