Can I / How do I use Mid-Side audio with OBS ?

[benoitvm]

I have raw M+S audio embedded in a connected HDMI input device 'stereo' channels : is it possible to dematrix M+S into a suitable stereo audio input ? I see there a ' invert polarity' filter, but I need to figure out how to split the side mic channel to two separate mono tracks then add them together with the mid channel (M+S & M-S)....