javascript - amCharts 4 - Include titel and watermark in exported image using .export()

Question

How to include an image title and a watermark but only into the exported image using .export()?

This example shows a function with .export()

https://codepen.io/team/amcharts/pen/ergXmr?editors=1111

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

// Add data
chart.data = [{
  "category": "Research & Development",
  "value": 3.5
}, {
  "category": "Marketing",
  "value": 6
}, {
  "category": "Distribution",
  "value": 4.2
}];

// Create axes
let categoryAxis = chart.xAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "category";

let valueAxis = chart.yAxes.push(new am4charts.ValueAxis());

// Create series
var series = chart.series.push(new am4charts.ColumnSeries());
series.dataFields.valueY = "value";
series.dataFields.categoryX = "category";
series.name

// Custom export function
function exportPNG() {
  chart.exporting.title = "myTitle"; /* not working */
  chart.exporting.export("png");
}

var options = chart.exporting.getFormatOptions("png");
options.keepTainted = true;
chart.exporting.setFormatOptions("png", options);

I also need a watermark (only in the exported image):

var watermark = chartPie.createChild(am4core.Label);
watermark.text = "Source: [bold]www.domain.com[/]";
watermark.align = "right";
watermark.fillOpacity = 0.5;
watermark.marginRight = 10;
watermark.marginBottom = 10;

Answer 1

等待大神答复