Using the API, can I display a custom message to someone in the Waiting Room?

We use the Zoom API to create and manage hundreds of meetings a week. We have a use case where we have a participant already waiting in the waiting room, and then the host is either not able to join or is running late and will join much later.

Rather than having this participant wait in the waiting room indefinitely, we would like to send a message to this participant that the host is running late or that he/she can no longer join and the meeting will be rescheduled.

How can we accomplish this? Can we display a custom message to that participant in that particular waiting room? 

Thanks,

-Alex