add something like this at top
I = <>^\markup \pad-around #1 \halign #-2 \concat{\italic {I \lower #.5
\pad-around #.2 \super 7}}
ii = <>^\markup \pad-markup #1 \halign #-2 \concat{\italic {ii \lower #.5
\pad-around #.2 \super 7}}
iii = <>^\markup \pad-markup #1 \halign #-2 \concat{\italic {iii \lower #.5
\pad-around #.2 \super 7}}
IV = <>^\markup \pad-markup #1 \halign #-2 \concat{\italic {IV \lower #.5
\pad-around #.2 \super 7}}
V = <>^\markup \pad-markup #1 \halign #-2 \concat{\italic {V \lower #.5
\pad-around #.2 \super 7}}
vi = <>^\markup \pad-markup #1 \halign #-2 \concat{\italic {vi \lower #.5
\pad-around #.2 \super 7}}
vii = <>^\markup \pad-markup #1 \halign #-2 \concat{\italic {vii \lower #.5
\pad-around #.2 \combine \super\draw-line #'(.7 . .9)\super o}}
then for the chords do
cmajortreble = {
\clef treble \key c \major \time 4/4
\I<c e g b>1 \ii<d f a c>1 \iii <e g b d>1 \IV<f a c e>1 \V <g b d f>1 \vi
<a c e g>1 \vii<b d f a>1
}
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