The Font Creator Tool may help you make Custom Unity Fonts easily using .png image files. This tool is still under development, however it does work in its current state.
You can Download the Font Creator Tool Package Above instead of Cloning the Repo.
The FCT uses old depricated methods to create the fonts. I haven’t figured out how to use the newer methods to achieve the same thing since the documentation sucks and I feel that the deprecated methods are way easier to use. Feel free to Clone and Update the code if you know how the newer methods work, please send me the update though.