My Idea is
1. Motion sensor reports to Alexa (via hub) when motion detected.
2. Now I want to trigger smart home skill to make an announcement through Alexa Device.
Example: Main gate sensor detected motion and Alexa announced in the room that "Main gate has been open...".
I have checked below announcement of motion sensor's published API
But didn't any information regarding making announcements from Smart Home skills on sensor state changes. First question is if announcements are possible from the Smart Home Skills and if yes then please give me some more details in order to create my Smart home Skills with announcements.