Very-very few Mac users visit this forum, but it might help if you give the source of the Gimp you use.
Gimp.org or Parthaor maybe an old one from gimp.lisanet.de and they all seem to use a different Gimp profile
Might/might not be something like /Users/MyName/Library/Application Support/Gimp/2.10/fonts
that is an old one and you say you do not have that Library entry.
You could ask on the pixlus forum https://discuss.pixls.us/ a few OSX users there. Give all the details OSX version, Gimp 2.10 but from where?
Gimp.org or Partha
Might/might not be something like /Users/MyName/Library/Application Support/Gimp/2.10/fonts
that is an old one and you say you do not have that Library entry.
You could ask on the pixlus forum https://discuss.pixls.us/ a few OSX users there. Give all the details OSX version, Gimp 2.10 but from where?