LibOVR for Passthrough on Quest 3

I have a PCVR application that interfaces with Quest devices via Quest Link and is implemented using LibOVR.

I am interested now in adding a mixed reality component to this application, for which I need a passthrough API in LibOVR. Does anyone know if such an API is available?

There is some description of a procedure for "Mixed Reality Capture," (https://developer.oculus.com/documentation/native/pc/dg-mrc/) but this appears to be for use of a totally external camera, and not the built-in passthrough cameras.