Hi Larry,
here is a quick workaround that might work for you using TEXT, the symbol | (shift-\ which is above the Return key on the computer keyboard) and underscore symbols (Shift-hyphen). Obviously there is no indication of 8th or quarter note triplet although you could insert a e3 or q3 in the text to indicate this I suppose.

irealbook://Triplet%3DFor%20Larry%3DMed ... 0%20%7C%20

For now, it would be a good idea to put the rhythm indications via text underneath the chords they relate to (of course!) because it might be possible to read the rhythm as meaning the chords below - since there is not much room vertically to separate the related chord/text line from the systems above and below the one you are intending.

I have quickly been working on your request 'Ruby, my Dear' using another different rhythm idea to show Massimo so am waiting a reply from him.