Does this work for you?
\version "2.18.2"
\relative c'' {
<b c>8\< q q q\!<b c>8 q q q
}
\relative c'' {
\once \override Hairpin.X-offset = #1.35
\override Hairpin.minimum-length = #5
<b c>8\< q q q\!
\once \override TextScript.layer = #2
\once\override TextScript.staff-padding = #3.4
\once\override TextScript.vertical-skylines = #'() <b c>8
_\markup \with-dimensions #'(2 . 7) #'(0 . 0)\with-color #red \filled-box
#'(-1.8 . .2) #'(0 . 2) #0
q q q
}
\relative c'' {
\once \override Hairpin.X-offset = #1.35
\override Hairpin.minimum-length = #5
<b c>8\< q q q\!
\once \override TextScript.layer = #2
\once\override TextScript.staff-padding = #3.4
\once\override TextScript.vertical-skylines = #'() <b c>8
_\markup \with-dimensions #'(2 . 7) #'(0 . 0)\with-color #white \filled-box
#'(-1.8 . .2) #'(0 . 2) #0
q q q
}
Stephen
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