Setting up an audio alert via chromecast when doorbell rings

[davelegg83]

Hi, hoping someone maybe able to help.
Within scrypted I have the reolink plugin and also the chromecast plugin installed.

I've gone to create an automation and set the trigger as Reolink Doorbell (Binary Sensor)

I'm not sure what to select for the automation action. I can see all of my chromecast speakers available, however only options seem to be start/stop or pause.

Any idea what I need to do for the action so I can have a message play when the doorbell is pressed? I've tried searching, but can't seem to locate anything.

Thanks in advance

Dave