Google Assistant play audio on smartphone (not openhab server speaker)

HI Openhab,

Is it possible for the audio from the text to speech being returned to the smartphone speaker where the google assistant app is being run on.

I want to speak to google assistant and hear the audio response. Currently this is output from the openhab server speaker (I am using WebAudio on as the default audio sink).

I cannot see this mentioned anywhere. Is this just not possible i.e you would normally have a google home speaker that would output the audio.