There’s no a such extension yet, but my first response was pointing to the extension that will be able to get the command offline, then you can use the default audio player/extension too can work for this, all you need is where/when/how to do this, so you must compare your desired command and tell the player what to do when the app detected/recognise a command, eg onRecognise=if text pause>true then=call player pause 
Then you can still use this extension