These vertical brackets are a special form of arpeggio; see 6.6.7
Arpeggio.
From that idea, I get this ugly solution
%%%%%%%%%%%%%%%%%%%%%%
\version "2.10.25"
\score {
\new Staff {
\override Staff.Arpeggio #'stencil = #ly:arpeggio::brew-chord-bracket
\override Staff.Arpeggio #'X-offset = #-1.2
<<
{< c' g' ees''>4 }
\\
{\hideNotes < d' e' >4 \arpeggio \unHideNotes}
\\
{\hideNotes < b' d''>4 \arpeggio \unHideNotes}
>>
\revert Staff.Arpeggio #'X-offset
}
}
%%%%%%%%%%%%%%%%%%%%%%
You have to find the right notes in the hidden voices
Gilles
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