You’re welcome. I’m not quite sure what to make of the sound issue you described, and I wonder if that might also be an indication of a failing unit. I wouldn’t hesitate to open a Support ticket for something like that.
The way I do it (and have read many others do it) is to have Google Assistant do a voice announcement on Google Home smart speakers/displays, but at least one Forum member uses a doorbell playlist, so that’s also an option.