[Chartjs]-How to loop tooptip additional data in chart.js

Replace your tooltip­‘s afterBody callback function …

ꜰʀᴏᴍ ᴛʜɪꜱ

tooltips: {
   callbacks: {
      afterBody: function(t, d) {
         return 'margin  ' + margin;
      }
   }
}

ᴛᴏ ᴛʜɪꜱ

tooltips: {
   callbacks: {
      afterBody: function(t, d) {
         return 'margin ' + margin[t[0].index];
      }
   }
}