在日历中如何按月列出年份组

Question

全日历中如何按月份列出年份分组？

listYear: {
  type: 'list',
  duration: { year: 1 },
  'numeric' 
},
listDayAltFormat: { 
  weekday: 'long' 
}, // day-of-week is nice-to-have
groupBy : 'Month'