I have a question about Inkscape extensions UI options. I need textarea input (not only one line for text input, but something like textarea html element), but as far as I studied the documentation I haven’t find out how to do this.

Is there any option how to add this type of input to interface of extension?

Original of my question can be seen here : https://answers.launchpad.net/inkscape/+question/470626

Thank you for your reply,