Multiroom speaker with scene

I cannot create a scene to activate The audio multiroom function with one Button.

I have Samsung soundbar HW-N960 and Samsung multiroom speaker VL551.

I can activate The audio multiroom function in ST app (new) by clicking on The soundbar and choose sound group and add The VL551 speaker. But this I have repeat every time I want to play music The next day or so.

If I create at scene for both speakers I can only choose to on/off, volyme & silent.

How to activate The audio multiroom function in a smoother way?

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