In Settings there’s an item called “Siri Shortcuts” when you tap on it a list of the available shortcuts will appear:
- Daily Meditation
- Featured Bedtime Story
- Favorite Bedtime Story
- Kids Bedtime Story
You can tap on any of them and a system screen will appear where it will ask the voice command for enabling this shortcut, you can enter anything you like.
Afterward any time you activate Siri and say <voice command> the shortcut will play.