I was able to make it work by doing this.
Look into your linked web font
https://fonts.googleapis.com/css?family=Sarala&subset=devanagari
There I see url to woff2
https://fonts.gstatic.com/s/sarala/v2/uK_y4riEZv4o1w9hDBcSAv4.woff2
Download and rename it.
Upload it as an asset to jsreportonline.
Use copy button to get the embedding code and paste it to the template.
In the end it looks like this.
<html>
<head>
<style>
@font-face {
font-family: 'Sarala';
src: url({#asset Sarala.woff2 @encoding=dataURI});
format('woff2');
}
</style>
<style>
* {
font-family: Sarala;
}
</style>
</head>
<body>
यह निबंध बहु
</body>
</html>
