如何在两行中以每行不同的字体大小显示标题？

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

function drawChart() {
var data = new google.visualization.DataTable();
data.addColumn('date', 'Date \& Time');
data.addColumn('number', "Triggered Events");
data.addColumn({type: 'string', role: 'tooltip'});
data.addRows([
	[new Date(2021, 11, 31, 0, 0, 0), 0, ''],


	[new Date(2021, 11, 31, 3, 41, 44), 0, ''],
	[new Date(2021, 11, 31, 3, 41, 44), 1, 'Event Duration: 2h 14m 57s\nMax Val: XYZ °C\nStart Time: 03:41:44\nEnd Time: 05:56:41'],

	[new Date(2021, 11, 31, 5, 56, 41), 1, 'Event Duration: 2h 14m 57s\nMax Val: XYZ °C\nStart Time: 03:41:44\nEnd Time: 05:56:41'],
	[new Date(2021, 11, 31, 5, 56, 41), 0, ''],

	[new Date(2021, 11, 31, 9, 40, 48), 0, ''],
	[new Date(2021, 11, 31, 9, 40, 48), 1, 'Event Duration: 2h 30m 17s\nMax Val: XYZ °C\nStart Time: 09:40:48\nEnd Time: 12:11:05'],

	[new Date(2021, 11, 31, 12, 11, 5), 1, 'Event Duration: 2h 30m 17s\nMax Val: XYZ °C\nStart Time: 09:40:48\nEnd Time: 12:11:05'],
	[new Date(2021, 11, 31, 12, 11, 5), 0, ''],

	[new Date(2021, 11, 31, 12, 45, 57), 0, ''],
	[new Date(2021, 11, 31, 12, 45, 57), 1, 'Event Duration: 2h 28m 9s\nMax Val: XYZ °C\nStart Time: 12:45:57\nEnd Time: 15:14:06'],

	[new Date(2021, 11, 31, 15, 14, 6), 1, 'Event Duration: 2h 28m 9s\nMax Val: XYZ °C\nStart Time: 12:45:57\nEnd Time: 15:14:06'],
	[new Date(2021, 11, 31, 15, 14, 6), 0, ''],

	[new Date(2022, 0, 1, 0, 0, 0), 0, '']
]);   //End data.addRows([])

var options = {
	title:'Generated 3 Events\nAverage Event Duration: 2h 24m 27s\nLine 3\nLine 4\nLine 5',
	tooltip: {textStyle: {fontName: 'Lucida Console', fontSize: 12} },
	width: 1100,
	height: 500,
	lineWidth: 1,
	chartArea:{width: 900, height:150 },
	series: { 0: { color: '#188785', areaOpacity: 1.0}},
	legend: {position: 'none'},
	enableInteractivity: true,

	hAxis: {
		title: 'Date \& Time',
		titleTextStyle: {bold: false, italic: false},
		format: 'dd/MM/yyyy HH:mm',
		slantedText:true,
		slantedTextAngle:90,
		gridlines: {color: 'none'},
		},  //End hAxis

	vAxis: {
		title: 'Events Triggered',
		titleTextStyle: {bold: false, italic: false},
		viewWindow: {min: 0, max: 1},
		ticks: [{ v: 0, f: 'Event Off'}, {v: 1, f: 'Event On'}],
		gridlines: { color: 'transparent' }
		},  //End vAxis

	};  //End var options

  var chart = new google.visualization.AreaChart(document.getElementById('chart_div'));

  // listen for chart ready event
  google.visualization.events.addListener(chart, 'ready', function () {
    // get label copy to change
    var labelContent = options.title.split('\n');

    // get chart labels
    var labels = chart.getContainer().getElementsByTagName('text');

    // loop chart title lines, beginning with second line
    for (var l = 1; l < labelContent.length; l++) {
      // find chart label
      for (var i = 0; i < labels.length; i++) {
        if (labels[i].textContent === labelContent[l]) {
          // reduce font size
          var currentFontSize = parseInt(labels[i].getAttribute('font-size'));
          labels[i].setAttribute('font-size', currentFontSize - 4);
          break;
        }
      }
    }
  });

  chart.draw(data, options);
}

<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>