Add-on to avoid stop media player playback when using tts to notify messages

Hi all,
when I use my google home speaker to play spotify music and I receive tts notifications from some automation, the speaker stops to play. Some time ago I read about an add-on to avoid this behaviour, but now I cannot find it neither on HACS nor googling.
Does anyone know about this add-on?

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Thank you very much

anything for 2022 that still works like google assistant broadcast to device?