With the App „Android Native SBS“ you can use any app in a SBS Mode.
Check/Mark the apps from yopur installed app list, so that these will start in SBS style, when they get started.

Fine, cool, BUT.. you have to root your android smartphone.

and so i stopped here.. this would be the best way coming from phone side..
because i guess SONY will not add SBS Support for its PS4-Games, PS4-Side or RemotePlayApp-Side, because they want you to buy Morpheus Real 3D,
but hey, 2D is even cool too, please SONY make us a gift or extra app which we have to pay for to get SBS support in RemotePlay-App.

https://github.com/frma71/sbs