Adding parentheses around an expressive mark or chordal note

The \parenthesize function is a special tweak that encloses objects in parentheses. The associated grob is Parentheses.

\version "2.24"

\relative c' {
  c2-\parenthesize ->
  \override Parentheses.padding = #0.1
  \override Parentheses.font-size = #-4
  <d \parenthesize f a>2
}