Custom visualization: add text to configuration UI?

We’d like to add some text to the configuration UI of a custom visualization we’re building. 

The text will contain useful information about the data expected by the visualization, plus a hyperlink to an external page. It is meant to help new users who’ve never used the visualization before.

Is there a way to achieve this? The Github docs about Presenting Configuration UI don’t say much, nor it’s possible to open issues there. 

So was wondering if anyone has had a similar problem before… 

Thanks in advance! 

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