When casting Dolby Atmos video to Sonos, is it possible to cast only the audio stream?

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I have a Sonos Beam (Gen 2) soundbar and I have verified that I can cast Dolby Atmos audio to the soundbar using the Hi-Fi Cast app. However, there is a limitation. It does not work with Dolby Atmos video. It seems like the soundbar is rejecting the video stream.

 So my idea is, is it possible to cast only the audio stream and not the video stream when casting Dolby Atmos video? Does the Hi-Fi Cast app have this capability? If not, could you please implement this feature?