As it seem samsung soundbar Q90R only support Alexa and does not have google assitance intergrated. I started a thread already and the reply we get from both samsung and google seem to be blamning each other.
But in short NO, the soundbar cannot be added to any other ecosystem than Samsungs own Smart Things and with Alexa.
I would love to see that this is just a software issue and that they can add the other in a near future as you can add other samsung products to the google home eco system for example.
