Here is an alternate version, that uses visible grace notes with zero-length stems and blank space noteheads, which doesn't require spacers.
!NoteWorthyComposerClip(2.751,Single)
|Clef|Type:Bass
|Key|Signature:Bb|Tonic:F
|TimeSig|Signature:6/8
|Rest|Dur:4th,Dotted|Visibility:Never
|Chord|Dur:4th,Dotted|Pos:5^|Opts:Stem=Up,ArticulationsOnStem|Dur2:4th,Dotted|Pos2:3^
|Chord|Dur:8th,Grace|Pos:5z|Opts:Stem=Up,StemLength=0,Muted|Dur2:8th,Grace|Pos2:3z
|Bar
|Chord|Dur:4th,Dotted|Pos:4^|Opts:Stem=Up|Dur2:4th,Dotted|Pos2:2^
|Chord|Dur:8th,Grace|Pos:4z|Opts:Stem=Up,StemLength=0,Muted|Dur2:8th,Grace|Pos2:2z
|Chord|Dur:4th,Dotted|Pos:3^|Opts:Stem=Up|Dur2:4th,Dotted|Pos2:1^
|Chord|Dur:8th,Grace|Pos:3z|Opts:Stem=Up,StemLength=0,Muted|Dur2:8th,Grace|Pos2:1z
!NoteWorthyComposerClip-End