Oh, all right, I didn’t know that. Unfortunately, I’m not familiar with that either. I came across a thread that almost deal with the same topic. I don’t know if this link would help you, but here you could change the font in the engine: Jimbohalo10 - Engine settings font
If this changes the font of the UI of the Unreal Engine I don’t know. But I wish you still good success in the solution search!