Hey @rhodesgod,
Oddly enough I was chatting to @harshil1712 about this the other day. In my testing I found that you can map your OS font folder to the docker container by adding the below to the volumes.
- /usr/share/fonts/truetype/:/usr/share/fonts/truetype/host/
If you install the fonts on your server or pop them in a folder somewhere you can just map it to the container path of /usr/share/fonts/truetype/host and give the container a bounce and they should appear.