Google Nest Mini - TTS

A while back I set up a Text Box helper linked to an automation that pushed the text to my phone … Just as a trial.

This now works
But I’m trying to set it up to cast to my home speakers & it’ll be customisable.

Issue I’m having is, I can’t get my Google Nest Mini connected to Home Asssistant.

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Is it even possible to set this up to any device?