multiple chords over a single note

[Bric]

Hello,

Denemo lets me "attach" chord symbols to specific, discrete notes. I asked the 
lilypond crew how to engrave multiple chord symbols over and extended-duration 
note spanning, say, a whole measure.  Example: a whole note extending the full 
4/4 measure, with two chord symbols positioned within the measure - the first 
at the beginning of the measure, the second about half-way.

Attaching an illustration of what i'm after.

Is there any way to achieve this on the level of denemo controls, rather than 
having to export denemo to lilypond and edit the "\chordmode { ... } block in 
lilypond ?

(the blue G chord in the attachment is the symbol i can't attach, such that it 
is positioned over the hypothetical "half-note duration" in the measure.

multiple_chords.png
Description: PNG image