Linux multi-boot, config.plist location

Hi reddit, I would like to setup a Linux-Windows-macOS multi boot on my macbook 2015 pro with OpenCore installed. I found this guide https://Dortania.github.io/OpenCore-Multiboot/OpenCore/linux.html but this is not clear to me, where I can find the config.plst and how I can edit it from macOS? Could someone help me to locate it please?

Thanks in advance

Author: @r2d2cyborg