drawing a line between a note and a syllabe

[Germain G. Ivanoff-Trinadtzaty]

Dear all,
Vocal music, with lyrics following 1st voice.
How to draw a [dashed, dotted, normal] line from the 3rd or 4th voice "do" 
to the syllabe "tse" ?

Ideally, one could adjust a #'position = #'(n . m) property for this line 
(along with #'line-style).

Similarly, how to draw a left vertical bracket from a note to a line of 
lyrics ? from a note to a note of another staff ? (see attached 
"4-brackets.png")

Thanks,
Germain

pj : "test-lien-note-syllabe.ly"
pj : "test-lien-note-syllabe.png"
pj : "4-brackets.png"

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%produce a trimmed PNG with:
%lilypond -dbackend=eps -dno-gs-load-fonts -dinclude-eps-fonts --png
myfile.ly

%test-lien-note-syllabe.ly
%%%%%%%%%%%%%%%%%%%%%%%%%%

\version "2.12.3"
\include "italiano.ly"
\paper{
%indent=0\mm
%line-width=20\mm
%bookTitleMarkup = ##f
%scoreTitleMarkup = ##f
oddHeaderMarkup=##f
tagline = ##f
%oddFooterMarkup=##f
}

S = \relative {sib'4.( do8 sib4 la | sol4. la8 sib4) do}
A = \relative {sol'4.( la8 sol4 fa | mi4. fa8 sol4) la}
T = \relative {re2.( do4) | do2 r}
B = \relative {sol2.( la8[sib]) | do2 r}
L = \lyricmode { Troi -- tse }

\score
{
\new ChoirStaff
<<
 \new Staff
 <<
  {\key re \minor \clef "G"}
  \new Voice = "V1" << \voiceOne \S >>
  \new Voice = "V2" << \voiceTwo \A >>
 >>
 \new Lyrics = "WordsAll" \lyricsto "V1" { \L }
 \new Staff
 <<
  {\key re \minor \clef "F"}
  \new Voice = "V3" << \voiceOne \T >>
  \new Voice = "V4" << \voiceTwo \B >>
 >>
>>
}

\layout {}

test-lien-note-syllabe.ly
Description: Text Data

test-lien-note-syllabe.png
Description: PNG image

4-brackets.png
Description: PNG image