title: How to customize macOS print modal for an app?
body: <p>Looking at an existing macOS app I see the print modal has an app specific option:</p>
  <blockquote>
  <p>Don't print bracketed chords (hide [C], [Dm], etc.)</p>
  </blockquote>
  <p><a href="https://i.stack.imgur.com/stvGG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/stvGG.png" alt="App screenshot" /></a></p>
  <p>Toggling this option updates the preview instantly.
  Could someone point me in the direction for the documentation for this feature of customising the print modal?</p>