Auto Stop Siri-Activated Video Recording Shortcut

I’m hoping to be able to start a shortcut with Siri that starts a video recording, stops the video recording automatically after a selected duration, and then saves the video. I’ve been able to have Siri activate the shortcut and auto-start a video recording, but there does not currently seem to be a way to automatically stop the recording - I’ve had to manually stop the recording by touching the screen (defeating the purpose > hands free video recording from start to finish). Supposedly you used to be able to just use Siri to start and stop a video recording but that does not seem to be possible anymore.