There's a folder Assets/_Game/Fonts with the font in it: Orbitron-Regular SDF.asset. This asset can be used in a Text Mesh Pro component, in section Main Settings, in slot Font Asset.
If you want to add a new font, you can download a font online, use the Font Asset Creator to make a SDF .asset file, and use it in a Text Mesh Pro component.
If you're still having issues, I'll try to answer!