\score{
  \new PianoStaff <<
    \override PianoStaff.InstrumentName #'self-alignment-X = #RIGHT
    \set PianoStaff.instrumentName = \markup{\right-align\bold\fontsize #3 2.}
    \new Staff = "up" {
      \clef treble
      \time 2/4
      \new Voice
\include "dir/rh2.ily"
    } 
    \new Staff = "down" {
      \clef bass
      \new Voice
\include "dir/lh2.ily"
    }
  >>
}