Nvidia CloudXR XR application development

Hi everyone,

Anyone using unreal engine to develop XR application for Nvidia CloudXR streaming ?
I am particularly interested in the AR streaming of Nvidia CloudXR but have no idea how to implement the required alpha channel in the left eye stream. This alpha channel is used to blend the rendered content with the live camera stream. Anyone have any info on how this can be implemented in unreal engine ?

Nvidia CloudXR