piano glissandi

Hello
How can I best achieve the piano glissando shown on the handwritten attachment. You can see on the other snip that I've used the glissando option with with wavy lines but these want to "anchor" themselves to the next note, instead of the Rest in the same stave.
The composer requires this to be played by stroking the piano strings themselves - I suppose like a harp.
Any suggestions on how I can show this on Musescore....
thank you
rachel