mymarkup = {
  \once \override TextScript.outside-staff-padding = 0
  \once \override TextScript.staff-padding = 0
  \once \override TextScript.padding = 0.2
  \once \override TextScript.X-offset =
    #(lambda (g)
       (+ (ly:self-alignment-interface::centered-on-x-parent g)
          (ly:self-alignment-interface::x-aligned-on-self g)))
}

\relative c' {
  g\open
  \mymarkup
  g^\markup \combine
      \musicglyph "scripts.open"
      \musicglyph "scripts.tenuto"
  \mymarkup
  g^\markup \combine
      \musicglyph "scripts.open"
      \musicglyph "scripts.stopped"
  g\stopped
}