score:0

simonbrunel gives a solution: link and fiddle https://jsfiddle.net/simonbrunel/y1ry2cvb/.

if you want to use icons in chart, you must give a fontfamily, in my case i use icons from fontawesome

options: {
  scales: {
    xaxes: {
      ticks: { 
        fontfamily: 'fontawesome',
      }
    }
  }
}

and after that, im using unicod: \uf071 -->> exclamation-triangle


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