Adding a shortcut to the Shortcuts app without INUIAddVoiceShortcutViewController?

Many apps that I download from the App Store seem to be adding shortcuts to the Shortcuts app, without me ever setting up a voice command. I was under the impression that to add a shortcut to the Shortcuts app, a user would need to create a voice command, via INUIAddVoiceShortcutViewController, which would then add the shortcut to the Shortcuts app.

This is how I am currently adding a shortcut in my app, but am wondering how I could go about offering shortcuts in the Shortcuts app without needing to call INUIAddVoiceShortcutViewController?

Code Block 
 let activity = NSUserActivity(activityType: "com.example.shortcut")
 activity.title = "Sample Shortcut"
 activity.userInfo = ["speech" : "This is a sample."]
 activity.isEligibleForSearch = true
 activity.isEligibleForPrediction = true
 activity.persistentIdentifier = "com.example.shortcut.myshortcut"
           self.view.userActivity = activity
 activity.becomeCurrent()
           
 let siriShortcut = INShortcut(userActivity: activity)
           
 // Setup view controller
 let viewController = INUIAddVoiceShortcutViewController(shortcut: siriShortcut)
           
 // Setup modal style
 viewController.modalPresentationStyle = .formSheet
           
 // Setup delegate
 viewController.delegate = self
           
 // Show view controller
 DispatchQueue.main.async {
    self.present(viewController, animated: true, completion: nil)
 }