Feedback from tablet on wake word detected for automation

I'm using the companion app on my tablet as a Home Assistant dashboard, but I'm missing some feedback to let me know when the wake-up word has been detected in the companion app on the tablet. However, I can't find a “wake-up word detected” trigger or anything like that in the automations.

Do you have any idea how I could make the tablet say something when the companion app detects the wake-up word?