That is disappointing but I kind of figured. Thank you!Afraid not.
It is possible to add fonts to the iPad, but they can only be used in the apps that access them. Mostly word processing and/or creative apps, maybe some of the reading apps.
The default font can be made heavier, larger, or a few other modifications, but the font itself can not be swapped out. Most of the adjustments are found in Settings > Display & Brightness, and Settings > Accessibility.