Bind custom data with date in bootstrap datepicker

Question

I have the count of the total user registered on the particular date. Like the image below. How can I display them with the date? I am using multidatespickr

Is there any way to do this?

UPDATE : pre-selected dates:

$('#with-altField').multiDatesPicker({
          altField: '#altField',
          minDate: 0,
          dateFormat: 'yy-mm-dd',
          addDates: ['2016-04-17','2016-04-16','2016-04-18'], // for pre-selected dates
          numberOfMonths: 3
        });