Multiple Value Axes in amCharts 4

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="./amcharts4/core.js"></script>
<script src="./amcharts4/charts.js"></script>
<script src="./amcharts4/maps.js"></script>
<script src="./amcharts4/themes/animated.js"></script>
<div style="width: 100%;max-height: 500px;height: 100vh;" id="chartdiv"></div>
<script>
	am4core.ready(function() {
		// Themes begin
		am4core.useTheme(am4themes_animated);
		// Themes end

		// Create chart instance
		var chart = am4core.create("chartdiv", am4charts.XYChart);

		// Increase contrast by taking evey second color
		chart.colors.step = 2;

		// Add data
		chart.data = generateChartData();

		// Create axes
		var dateAxis = chart.xAxes.push(new am4charts.DateAxis());
		dateAxis.renderer.minGridDistance = 50;
		dateAxis.renderer.labels.template.location = 0.0001;
		dateAxis.baseInterval = {
			 "timeUnit": "second",
			 "count": 1
		}

		// Create series
		function createAxisAndSeries(field, name, opposite, bullet, numberFormat) {
		  var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
		  if(chart.yAxes.indexOf(valueAxis) != 0){
			valueAxis.syncWithAxis = chart.yAxes.getIndex(0);
		  }
		  
		  var series = chart.series.push(new am4charts.LineSeries());
		  series.dataFields.valueY = field;
		  series.dataFields.dateX = "date";
		  series.strokeWidth = 2;

		  series.yAxis = valueAxis;
		  series.name = name;

		  if(field == "T0"){
			series.tooltipText = " {date.formatDate('YYYY-MM-dd hh:mm')} \n {name}: [red bold]{valueY}°C[/]";
			series.stroke = am4core.color("red");
			
		  }else if(field == "RH"){
			series.tooltipText = " {date.formatDate('YYYY-MM-dd hh:mm')} \n {name}: [blue bold]{valueY}%[/]"; 
			series.stroke = am4core.color("blue");
		  }

		  series.tensionX = 0.8;
		  series.showOnInit = true;
		
		  var interfaceColors = new am4core.InterfaceColorSet();
		  
		  switch(bullet) {
			case "RH":
			 var bullet = series.bullets.push(new am4charts.CircleBullet());
				bullet.circle.strokeWidth = 2;
				bullet.circle.radius = 4;
				bullet.circle.fill = am4core.color("#fff");
				bullet.circle.stroke = am4core.color("blue");
				var bullethover1 = bullet.states.create("hover");
				bullethover1.properties.scale = 1.3;	
				valueAxis.title.text = "相對濕度 (%)";
				break;
			case "T0":
				// Make bullets grow on hover
				var bullet = series.bullets.push(new am4charts.CircleBullet());
				bullet.circle.strokeWidth = 2;
				bullet.circle.radius = 4;
				bullet.circle.fill = am4core.color("#fff");
				bullet.circle.stroke = am4core.color("red");
				var bullethover1 = bullet.states.create("hover");
				bullethover1.properties.scale = 1.3;
				valueAxis.title.text = "氣溫 (°C)";
	
				break;
			default:
				var bullet = series.bullets.push(new am4charts.CircleBullet());
				bullet.circle.stroke = interfaceColors.getFor("background");
				bullet.circle.strokeWidth = 2;
				break;
			} 
			valueAxis.renderer.line.strokeOpacity = 1;
			valueAxis.renderer.line.strokeWidth = 2;
			valueAxis.renderer.line.stroke = series.stroke;
			valueAxis.renderer.labels.template.fill = series.stroke;
			valueAxis.renderer.opposite = opposite;
			valueAxis.numberFormatter = new am4core.NumberFormatter();
			valueAxis.numberFormatter.numberFormat = numberFormat; 
		}
		createAxisAndSeries("T0", "氣溫", true, "T0", "#°C");
		createAxisAndSeries("RH", "相對濕度", false, "RH", "#'%'");
	
		// Add legend
		chart.legend = new am4charts.Legend();

		// Add cursor
		chart.cursor = new am4charts.XYCursor();
		chart.dateFormatter.inputDateFormat = "yyyy-MM-dd H:m";
		
		chart.scrollbarX = new am4core.Scrollbar();
		chart.scrollbarX.parent = chart.bottomAxesContainer;

		// Enable export
		chart.exporting.menu = new am4core.ExportMenu();
    chart.exporting.menu.items[0].icon = "data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIi";
		// chart.exporting.menu.container = document.getElementById("tools");

		// generate some random data, quite different range
		function generateChartData() {
			var chartData = [];
			chartData.push({date: "2020-03-04 00:00",RH: "78.7",T0: "20",});
			chartData.push({date: "2020-03-04 00:01",RH: "78.8",T0: "20",});
			chartData.push({date: "2020-03-04 00:02",RH: "79.1",T0: "20",});
			chartData.push({date: "2020-03-04 00:03",RH: "79.1",T0: "20",});
			chartData.push({date: "2020-03-04 00:04",RH: "78.9",T0: "20",}); 
			return chartData;
		}
	}); // end am4core.ready()

	$(document).ready(function(){
		$("g[aria-labelledby='id-66-title']").hide();
	})
</script>

Ouput: