Prerequisites

• System Font Changer - by Ashborn
• Any font file

Here's a video tutorial of steps 1 and 2 courtesy of AshBorn:

1. Make 3 more copies of the font file (.ttf extension) and rename all of the files to: SourceSansPro-Regular.ttf, RobotoStatic-Regular.ttf, Roboto-Regular.ttf and DroidSansMono.ttf.

2. Go into or extract the zip file and go to /system/fonts and copy and replace the files there. Rezip the extracted files if you extracted them.

3. Flash the zip file with Magisk Manager or KernelSU and if everything worked you will see

<img src="https://files.catbox.moe/jnpedt.jpg" height=400