\relative c' {
\balloonGrobText #'Stem #'(3 . 4) \markup { "I'm a Stem" }
<c-\balloonText #'(-2 . -2) \markup { \simple #"hoi" } >8
\relative c' {
\balloonGrobText #'Stem #'(3 . 4) \markup { "I'm a Stem" }
<c-\balloonText #'(-2 . -2) \markup { \simple #"hoi" } >8