Mark, I think what you really want are the accessibility settings. You don't need to install new fonts, that route will just be more difficult to solve the problem of making it easier to read.
https://www.samsung.com/us/support/answer/ANS00062641/ which leads to https://www.samsung.com/us/support/answer/ANS00085504/.
This allows you to change from available fonts, font size, magnification, contrast and other options.
Do I have to choose "SamsungSans" in Fonts?
I'm looking for a way to get a bunch of fonts on my phone not just Samsung sans
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