Shortening volta brackets

By default, volta brackets are drawn over all of the alternative music, but it is possible to shorten them by setting voltaSpannerDuration. In the snippet, the bracket spans onle a single measure, which has a duration of 3/4.

\version "2.24"

\relative c'' {
  \time 3/4
  c4 c c
  \set Score.voltaSpannerDuration = #(ly:make-moment 3/4)
  \repeat volta 5 {
    d4 d d
    \alternative {
      \volta 1,2,3,4 {
        e4 e e
        f4 f f }
      \volta 5 {
        g4 g g } } }
}