Formatting lyrics syllables

The \markup command can be used in \lyricmode blocks to format individual syllables in lyrics.

\version "2.24"

mel = \relative c'' { c4 c c c c1 }
lyr = \lyricmode {
  Your lyrics \markup { \italic can }
  \markup { \with-color #red contain }
  \markup { \fontsize #8 \bold Markup! }
}

<<
  \new Voice = "melody" \mel
  \new Lyrics \lyricsto "melody" \lyr
>>