function shsFont(lang, weight) {
  const pathInProject = 
    `fonts/SourceHanSans${lang}/SourceHanSans${lang === 'J' ? '' : lang}-${weight}.json`;
  const fullPath = expandPath(pathInProject);
  if (!fs.existsSync(fullPath))
    throw Error(`Dumped Source Han Sans ${pathInProject} is not found.`);
  return shsFont(pathInProject);
}
Get Source Han Sans font data
@param { 'J' | 'K' | 'SC' | 'TC' } lang 
@param { 'ExtraLight' | 'Light' | 'Normal' | 'Regular' | 'Medium'
| 'Bold' | 'Heavy' } weight Specified weight