Configure your chartOptions:

  public chartOptions: any = {
    responsive: true,
    scales: {
      xAxes: [{
        ticks: {
          fontColor: 'red',
        },
      }],
      yAxes: [{
        ticks: {
          fontColor: 'red',
        },
      }]
    },
    legend: {
      labels: {
        fontColor: 'red',
      },
    }
  };