Add Presense Detection or Triggering

[JohnTranQUT]

Echo Gen 4 all have presence detection via Ultrasound.

If this can be used or tracked, it would allow for the advantage of starting automation in Home Assistant without the need for a separate motion detector or use of a Home-Assistant Core Amazon Alexa setup.

Home-Assistant Nabu Casa Account only allows for syncing of 1 Amazon Alexa whilst Alexa Media Player allows for syncing of multiple Amazon Alexa Accounts. There are distinct advantages of Presence detection across multiple Amazon Accounts for triggering automation on Home Assistant.
One advantage is that a single Home Assistant will send/receive commands across multiple Amazon accounts and therefore greater personalization such as more personalized Todo, Shopping lists, and work locations.

The above is advantageous when living in a home with multiple members. Todo lists, music Spotify, and so forth are seperated per account and so an individual per room/device does need to share a single Amazon account and Skills (eg Spotify accounts) across all devices.