you can just import these fonts to your Glitch project. Or by adding the fonts via git
git clone https://<user-token>@api.glitch.com/git/<project-name>
git checkout -b local
then you can copy the fonts into one fo the directory.
After that you’ll have to upload them to Glitch:
git add .
git commit -m "Added fonts"
git push -u origin local
Then you’ll go into the Glitch Console for your project to merge the local branch with the master branch.
git merge local
refresh
The refresh command is to refresh the connection between the editor and your project.