Multi-Process/Offscreen Rendering in nDisplay

Per the UE 5.2 roadmap:
“In advance of SMPTE 2110 availability, nDisplay can now be run in a multi-process configuration that renders the inner frustum offscreen in a separate Unreal Engine process and shares it back to another process rendering the outer viewports on the same render node. This can improve content performance without the need to change the hardware topology of the stage.”

Could someone help with how to set this up in 5.2 preview? Thanks!