Chart BackgroundImage in Background

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There are two ways to set the background image on the chart:
LAYOUT
Set the <Image> element within the <backgroundElements> element.
HTML
Set the background-image property in the <DIV> element where a chart is created.
In this example, an <Image> element is set within a <backgroundElements> element.
<backgroundElements>
<Image source="https://www.koolchart.com/demo/KoolChart/Assets/Images/chart_background.jpg" maintainAspectRatio="false" alpha="1"/>
</backgroundElements>