I am trying to make a ZingCalendar chart basically for monthly attendance. I have the days array, but I want an objects within objects to to pass that to the graph.

Like :

 items: { 
        'd-2016-01-01': {
          backgroundColor: 'purple',
        },
        'd-2016-02-01': {
          backgroundColor: 'purple',
        },
}

I have an array like this : 
0 : {
"d-2022-01-01":{backGroundColor:"black"}
},
1 :{
"d-2022-01-02":{backGroundColor:"black"}
},