Using external library on Custom Widget

Question

Hi,

I am trying to use an external library in a custom widget. To do so, I have configured it on the whitelist as detailed in here:

https://knowage-suite.readthedocs.io/en/8.0/functionalities-guide/cockpit/index.html?highlight=custom%20chart#custom-chart-widget

I have also included the kn-import tag on the html editor within the custom widget, as explain on the manual.

It works when editing the cockpit, but when saving it, I get the following error message:

Invalid HTML Payload

How should I configure the external library?

Thanks!