lilypond fingeringOrientations spanner?

[Peter Terpstra]

Dear People,
Don't know if this exists, could not find it on internet, guess that if it 
exists people in this group would now about it.

Would like to draw a line between the numbers of the fingeorientations, a line 
from finger 1 to 1, 2 to 2, 3 to 3.
Tried to do something with \draw-line but could not make a fit.

Example without lines here:

\version "2.18.2"

\header {
    tagline = ##f
}

\paper {
  #(set-paper-size "a4")
}

scoreAGlobal = {
  \key d \major
  \time 4/4
}

upper = \relative c' {
  \scoreAGlobal
    \set fingeringOrientations = #'(up)
    <cis-3>16<e-0><a,-2> b<c-2-1>8 cis d dis e f | fis g <gis-2-1> <a-3-1> bes 
b <c-3-1> <cis-2-4>
}

lower = \relative c {
  \scoreAGlobal
   b4\rest a'16 a, ais' a, b' a, bis' a, cis' a, d' a, | dis' a, e'' a,, eis'' 
a,, fis'' a,, g'' a,, gis'' a,, a'' a,, g'' a,,
  
}

\score {
  \new Staff { \clef "treble_8" << \upper \\ \lower >> }
  \layout { }
}