Previewing "Say Cheese" selfie?

Trying to use the “Say Cheese” shortcut to take selfies on an iPhone 14 Pro. Is it possible to frame the shot in the camera app with the front-facing camera – to see what the photo will look like – and then say “Hey Siri – say cheese!” It seems that I cannot use Siri when the camera app is open. Looking for a way to see the photo on the screen facing me and then verbally getting Siri to snap it. Appreciate any insight on how to do this.