How to output key+fill

I am using Notch to chromakey a camera feed in real-time. The camera feed is ingested by a Blackmagic Decklink 8K Pro card and sent to Notch.

I am getting a nice key in Notch in realtime with a “Video In Source” Node, a “Chromakey” Node and an “Image2D” Node.

I now would like to output the key and the fill as two separate but synchronised feeds. Ideally those two feeds would be output from Notch via two SDI connectors of the BM Decklink 8K Pro or alternatively with Spout.

How would I setup such an output in Notch?

Thanks a lot.