I believe no new API is necessary, as shown by this code snippet :

#include <ApplicationServices/ApplicationServices.h>
  
  CTFontRef ft = CTFontCreateUIFontForLanguage(kCTFontUIFontSystem, 0, NULL);
  CFStringRef str = CTFontCopyFullName(ft);
  char fname[60];
  CFStringGetCString(str, fname, sizeof(fname), kCFStringEncodingUTF8);
  Fl_Fontsize size = CTFontGetSize(ft);
// printf("%s [%d]\n", fname, size);
  Fl::set_font(FL_FREE_FONT, fname);
// at this point, the system font is obtained by
  fl_font(FL_FREE_FONT, size);

This requires macOS 10.5 or above.

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