const result = await navigator.mediaCapabilities.decodingInfo({
    type: 'media-source',
    audio: {
        contentType: 'audio/mp4;codecs=ec-3',
        channels: 16,
        spatialRendering: true
    }
});
console.log(result);

https://webapi.streaming.dolby.com/v0_9/help_files/topics/checking_immersive_capability.html