Inserted chart in WYSIWYG editor is not visible

Simon Urli so your problem was only with the standalone WYSIWYG editor?

apparently yes.

If so, then you could use what's indicated on https://extensions.xwiki.org/xwiki/bin/view/Extension/CKEditor+Integration#HExecuteJavaScriptcodeinsidetheeditingarea28XWiki10.102B29 , i.e. pass:

Unknown macro: {'wysiwyg'}

when loading the JSX.

Apparently we're already using it, see: https://github.com/xwiki-contrib/application-chartjs/blob/master/application-chartjs-ui/src/main/resources/XWiki/ChartJS/WebHome.xml#L1185