LilyPond: Indicate alternate endings

Question

Using LilyPond, I would like to indicate alternate endings to the piece I am engraving; an "Optional 'Screen Gems' Ending" which is 2 measures long or another "Low Fat" ending (not my terms; they are in the original score) which is 1 measure. I would like notation similar to 1st and 2nd endings but without the repeat, of course.
How do I do this?

Answer 1

See here for the LilyPond documentation on long repeats.

\version "2.24.0"

voltaFirst = \markup \text "Gems"
voltaSecond = \markup \text "Fat"

\relative {
  e'4 e e e
  \set Score.repeatCommands = #(list(list 'volta voltaFirst))
  g2 g g g \bar "||"
  \set Score.repeatCommands = #(list(list 'volta voltaSecond))
  d1
  \set Score.repeatCommands = #'((volta #f))
  \bar "|."
}

You can add usual markup arguments after \text to change how it's displayed.