Tremolo Picking - need slashes below tab note

[Lee]

I'm transcribing some guitar music with tremolo picking which means the
single note is up/down picked very rapidly.

I've managed to get the double slashes on the staff with code below -
thanks to the super documentation.

Is it possible to get the double slash on the tab sheet just below the note
whilst keeping it on the staff?

\version "2.25.7"

myNotes = \relative c'  {
  \repeat tremolo 4  g16
  \repeat tremolo 4  a16
  \repeat tremolo 4  b16

}

\score {
  <<
    \new Staff {
      \clef "treble_8"
      \myNotes
    }
    \new TabStaff
    \myNotes

  >>

}

Appreciate help.   Everything I've needed to do with notation has been
possible so far.