Airplay video on Apple TV while still using IPAD/IPHONE speakers?

Hey everyone, quick question.

How do I airplay a video from my iPad/ iPhone onto my Apple TV, but still use my device speakers as the audio source?

(what I have been doing is connecting a bluetooth speaker to my TV, so whatever I airplay onto it will have audio from my speaker. However I want to be able to just use my device as my audio but video on TV)