Alexa Voice Monkey Trigger Monkey (Routine). Google Assistant Activate scene.

When LG TV turns off/on via LG ThinQ's Google Home integration trigger Alexa routine (via doorbell)

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Can be used with any device google accepts as a trigger, but be warned some devices google assistant doesn't differentiate between turn on and off, just a change in status. Google Home triggers IFTTT scene, that then triggers an Alexa doorbell via VoiceMonkey trigger (under devices) that then triggers a doorbell you can use in Alexa. Turn off the default doorbell notifications if you want silent operation.