Google Timeline Chart的标签颜色或条形颜色，按行显示

google.charts.load('current', {'packages':['timeline']});
google.charts.setOnLoadCallback(drawChart);

function drawChart() {
  var container = document.getElementById('timeline');
  var chart = new google.visualization.Timeline(container);
  var dataTable = new google.visualization.DataTable();

  dataTable.addColumn({ type: 'string', id: 'Task' });
  dataTable.addColumn({ type: 'string', id: 'Label' });
  dataTable.addColumn({ type: 'date', id: 'Start' });
  dataTable.addColumn({ type: 'date', id: 'End' });

  dataTable.addRows([
    ['Event 1', 'Category 1', new Date(2022, 0, 1), new Date(2022, 0, 5)],
    ['Event 2', 'Category 2', new Date(2022, 0, 6), new Date(2022, 0, 10)],
    ['Event 3', 'Category 1', new Date(2022, 0, 11), new Date(2022, 0, 15)],
    ['Event 4', 'Category 3', new Date(2022, 0, 16), new Date(2022, 0, 20)],
  ]);

  var options = {
    colors: ['red', 'blue', 'green'], // 设置标签颜色或条形颜色
  };

  chart.draw(dataTable, options);
}