ChartJs Format numbers

If you can do it in ChartJS via JavaScript, then you can do it in Wisej. So it should be possible.

As for what javascript to write, check out this StackOverflow post: https://stackoverflow.com/questions/25880767/chart-js-number-format

Note that some of the examples have you set the “options” of the ChartJS widget. You can read the Wisej documentation on widget options here: https://docs.wisej.com/api/wisej.web/content/widget#options

Other useful Wisej documentation:
https://docs.wisej.com/docs/concepts/javascript
https://docs.wisej.com/docs/controls/content/widget

You also mention setting the locale. You can try the ToLocaleString() method: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString

Here’s an example of using ToLocaleString with the Eval function. (Eval lets you call javascript code from C#. In this case, the javascript code is  var x= 123456.789; x.toLocaleString('en-US'); )

Application.Eval("var x= 123456.789; x.toLocaleString('en-US');", (r) => { AlertBox.Show(r.ToString()); });

And here’s an example with EvalAsync:
var result = await Application.EvalAsync("var x= 123456.789; x.toLocaleString('en-US');");
AlertBox.Show(result);