Can you add a custom font to use in MS Word?

Every topic I find for installing custom fonts is related to the system font, which may or may not be related to apps' fonts like ms word, but I don't know, by I'm looking to use my custom handwritten font I made with the realfont app in ms word mobile. I've got the .ttf file ready to install/insert into the appropriate folder but don't know how/where. Anyone know? Thanks

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