title: Make "Broadcast from <name>" optional?
body: <p>Since 2 days, my google home, which is integrated with my smart home system, started saying "Broadcast from " followed by the actual Smart Home announcement, e.g. the washing machine is ready etc.</p>
  
  <p>Since there is also an integration with Nest Hello (which plays a doorbell sound, followed by a spoken text) i know it is possible to skip the "Announcement from " part. Anybody care to share tips/workarounds?</p>
  
  <p>Using: <a href="https://github.com/greghesp/assistant-relay" rel="nofollow noreferrer">https://github.com/greghesp/assistant-relay</a></p>