Cast audio to Google Nest Audio speaker group

Questions & Help
1

Hi

I’m trying to cast an alarm sound to all my Google Nest Audio speakers
I can only Cast the sound to each speaker, which results in a delay, meaning all speakers are out of sync.

Google home has the possibility to make a speaker group.
Is there a way to trikke this group?

2

Stupid me, just found the solution.
When you have created the speaker group, search for new Google Chromecast units