chart.js line chart multiple labels

const myChart = new Chart(ctx, {
    type: 'doughnut',
    data: {
        datasets: [{
            data: [1, 2, 3, 4, 5],
            backgroundColor: [
                'green',
                'yellow',
                'red',
                'purple',
                'blue',
            ],
            labels: [
                'green',
                'yellow',
                'red',
                'purple',
                'blue',
            ]
        }, {
            data: [6, 7, 8],
            backgroundColor: [
                'black',
                'grey',
                'lightgrey'
            ],
            labels: [
                'black',
                'grey',
                'lightgrey'
            ],
        },]
    }
  //....