\include "predefined-guitar-fretboards.ly"

my_chords = \chordmode {
  a:m s s c s s d:m s s e
}

#(define (text-interface::print-X-centered grob)
  (ly:stencil-aligned-to (ly:text-interface::print grob) X CENTER ))

\markup {
  \fill-line {
    \score {
      <<
        \new ChordNames << \my_chords >>
        \new FretBoards << \my_chords >>
      >>

      \layout {
        \context {
          \ChordNames
          \override ChordName.stencil = #text-interface::print-X-centered
        }
        \context {
          \FretBoards
          \override FretBoard.align-dir = #CENTER
        }
      }
    }
  }
}