uxer
Create a fonts folder somwhere, /usr/local/share/fonts/ OR ~/.fonts, wherever, it wont really matter.
Put the *.ttf in this folder then run doas fc-cache -v
By default I think fonts are kept in /usr/X11R6/lib/X11/fonts, so perhaps create a TTF folder in there?
EDIT:
pin I'd rather dump them in ${PREFIX}/share/fonts/X11/TTF/
Do this instead.