Markup + fermataMarkup over a note?

[James Harkins]

Hi all,

In an unmetered section, the soloist has some longish rests that I would like 
to notate this way, e.g.:

9-10"
fermata
full-bar rest (within the staff)

I know how to do the duration as a markup, and I know how to do \fermataMarkup, 
but I don't know how to combine them and center them.

I saw a mailing list post from 2008(!) saying that \fermataMarkup can go into a 
\markup{}, but either that post was mistaken, or the usage might have been 
valid in 2.10 but not anymore in 2.18.

I also looked for the \musicglyph identifier for a fermata, but this seems not 
to be documented in the Notation Reference's page on the Feta font. (Searching 
the page text for "fermata" failed.)

Thanks,
hjh