Hey there my friend. If you haven’t been keeping up to speed with the new UE4 audio engine development, you should check out my GDC talk in 2017 on youtube: The Future of Audio in Unreal Engine | GDC 2017 | Unreal Engine - YouTube
We’re only now getting the new audio mixer backend capable of doing 3rd party plugin support in a flexible way. If you know how Dolby ATMOS or DTS:X works, feel free to write a new spatializer plugin and sell it on the marketplace. All you need to do is check out the new IAudioSpatializationFactory and IAudioSpatialization interfaces. The code is open and available 
We’re currently working with several 3rd party audio plugin developers like Oculus (Oculus Audio), Sony (PSVR, Audio3D), Google (Resonance Audio), Valve (Steam Audio), and others to provide object-based binaural audio. All the above plugins are currently available in UE4 using the new audio engine.
We are also planning on implementing the brand-new Microsoft SASAPI using the new spatializaton plugin interface, which should allow native ATMOS support on Windows and XboxOne. But since Microsoft themselves aren’t doing it, we’ll have to wait till we have some time internally to develop it (there’s only 2 of us audio programmers at Epic).