How can this be done on iPad?
Is it possible to download additional fonts to my iPad?
iPad, iPadOS 13
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Subject to having installed iOS/iPadOS13 or later - yes, you can download and install additional fonts:
Install and manage fonts on iPad - Apple Support
Be aware that additional installed fonts can only be used with Apps that are coded to support the additional fonts.
Additional information can be found here
https://9to5mac.com/2019/06/12/ios-13-how-to-use-custom-fonts-on-iphone-and-ipad/