[lightsout]

My Netflix and Prime apps both do Atmos where available and it's now reported that it's working on the Disney+ app as well.

As to how, you just need an Atmos setup.

Are you talking about a 2019 version? 

I think so, 8.1.1 is only out for the 2019 version it seems :/ 

Unless something very recently changed (which would have definitely had folks talking) Atmos is not available for Netflix on the older Shields. I would be happy to be wrong.