How to send an Apple Watch notification which taps the user but doesn't vibrate the watch?

Does anyone know how to send a notification from a watchOS app that notifiers the user by lightly tapping the user’s wrist without also vibrating the watch? (An example of this type of gentle tap is when you get a iMessage notification.) Right now I’m setting UNMutableNotificationContent.sound to .defaultCritical which causes both the tap and the vibration, and just setting it to .default delivers the notification quietly with neither the tap nor the vibrate. Is there a way to get the tap without the vibration?

How to send an Apple Watch notification which taps the user but doesn't vibrate the watch?
 
 
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