Dear Medow1,
Welcome to the forum !
You can use two-note tremolos to write this. On the top staff, input the first chord of low notes as a quarter note, then the second chord. Select the first chord and press m. This will create cross staff notes, but both chords are still upstem voice 1 of top staff (probably). Select both chords, invoke repeats popover (shift-r), write 32 and enter. That’s it. Use f if you need to flip a chord. Bisbigliando can be input as text object (shift x) or you can create a text playing technique for it (so that you can use it again in this project, and if you need that in other projects, save it as default.)
Hope this helps !
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