score:2

Accepted answer

for global use: chart.defaults.font.family = "lato".
details here.

score:1

the correct way to specify would be like this (in options):

plugins: { // not plugin
  legend: { // extra layer: legend
    labels: { // with an "s"
      font: {
        family: "lato" // right here
      }
    }
  }
}

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