Piano with three staffs

No, there’s no built-in way to do this at the moment, I’m afraid.

I’d argue that while that is a legitimate example from published music it barely adds any useful performance or readability information to the pianist, given the large brace already there, and personally I would not be trying to do that.

I use three staves all the time for piano without feeling the need for that. Just a couple of cents worth!

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Another way (better, IMO): In Rachmaninoff’s famous C♯ minor prelude, when it goes to 4 staves the barlines are connected between pairs of staves for each hand.