Adding bar lines to ChordNames context

To add bar line indications in the ChordNames context, add the Bar_engraver.

\version "2.24.0"

\new ChordNames \with {
  \override BarLine.bar-extent = #'(-2 . 2)
  \consists "Bar_engraver"
}

\chordmode {
  f1:maj7 f:7 bes:7 
}