modify axes label fonts on usamap.m or geoshow.m

I would like to change the font style and use a LaTeX interpreter (from a function or script, not interactively) after plotting a map using usamap.m or geoshow.m. I attempted to find the latitude and longtitude XTickLabel or YTickLabel equivalents in the axes object structure, but each string was empty:

ax = usamap({'OK'});

f = fieldnames(ax);

ii = ~cellfun(@isempty, strfind(f, 'Label'));

f(ii)

Note f(ii) contains no Latitude or Longitude label. Nor do the Parent axes, as far as I can find.

Explicitly, I would like to change the font property of labels like what I have circled below in red. Thank you!

[Amato]

I've been wondering the same thing for some time now. Would be awesome to get an answer here.