Install MacOs Mojave (Only Bootcamp partition)
This link has a good starting point. First up, you obviously need to create a mac partition on the computer. Next, you will need to find a copy of macOs (obtainable via Mac App Store by all mac users, hence you only need to find a mac owner willing to give you a copy) and convert it into a bootable USB drive. Next, you have to boot into the mac partition on your computer and install macOS via the bootable drive.