JavaScript Chart.js - Custom data formatting to display on tooltip

Question

I have looked at various documentation and similar questions on here, but cannot seem to find the particular solution. Apologies if I have missed anything obvious or have re

Answer 1

tooltips: {
            enabled: true,
                  mode: 'single',
                  callbacks: {
                    label: function(tooltipItems, data) { 
                      return data.datasets[tooltipItems.datasetIndex].label+": "+tooltipItems.yLabel;
                    }
                  }
                }