Hello @lRRXl and welcome to the forum!
No Font-File will be installed in Krita, Fonts are provided from the operating system you use, so if you want to use a Font in Krita you have to install the Font in Windows, Linux, macOS, Android, Chromebook.
If any of the Fonts you named is installed in the OS you can use and place them in Krita, the first letter in Kanji, the second in Katakana, the third in Hiragana and so on, every letter a different Font if you like, but as said it has to be installed in the OS first not in Krita.
The only thing is, Krita’s text-functionality is not very nice, there are several topics about it and the developers know this and it is planned to improve Krita’s text tool in the future, but the future is endless…
Perhaps you want to try @KnowZero’s “Lazy Text Tool” Plugin for Krita instead?
it can be downloaded from here, you have to click on the green Code button on that site and select “Download ZIP”:
If I remember correctly, it is also capable to handle vertical fonts, but therefore you should ask @KnowZero.
Michelist