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Re:Using a Raspberry Pi to add a second HDMI port to a laptop by pcouy on Wednesday March 15, 2023 @11:45AM (#35170086)
You should be able to adapt the writeup to a macOS host, but I have no idea how you configure a virtual display on it
Re:Using a Raspberry Pi to add a second HDMI port to a laptop by strobe on Wednesday March 15, 2023 @12:08PM (#35170485)
one easiest solutions that I found is mac app BetterDisplayPro - even free version allows to create the Dummy display.