Hello M., and all,
For that you can use `creole`, see doc. here:
And add an img tag, like:
@startmindmap
* Creole on Mindmap
** You can change <color:red>text color</color>
** You can change <back:cadetblue>background color</back>
** You can change <size:18>size</size>
** You use <u>legacy</u> <b>HTML <i>tag</i></b>
** You use <u:red>color</u> <s:green>in HTML</s> <w:#0000FF>tag</w>
** Use image : <img:http://plantuml.com/logo3.png>
@endmindmap
I can add this on the documentation.
Enjoy,
Regards,
Th.