Dyanamic metadata

Is it possible to Post out metadata when there is no metadata being sent out.
for example:-
you set it to send out metadata on songs, and pre recorded shows etc but ideally you don’t want metadata sent when news is on for example or an ad break so would it be possible to send out metadata of anyones choosing for example “more of your favourite music coming up shortly” when the news is on or when there is an adbreak basicially anywhere you set it not to go out. instead of it sitting on the last song or show, until it comes across something you have set to go out.