Button Triggers Voice Assist Listen

Hello community.

I currently have Assist working with cloud, Gemini and starts with wake word, connected to the Voice Preview box and other mics and media players around the house.
I am trying to create an automation where clicking a button on my physical Onvis switch will prompt assistant to start listening - kind of making the button act as the wake word.
I am unable to find any entity or action where assist starts listening to link it to the button. Can you please assist on how to achieve that?

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