Here is the schematic from the github page. If you're thinking of doing this I highly recommend you read the github page.
If you have questions or issues related to this please respond to the github page.
I wanted a way to control dimming on multiple MeanWell drivers without using optocouplers and resistors.
I created this github page with all of the details to share for anyone else who's interested in doing the same.
Feel free to post issues or discussions on the github page if you're interested...