I'm currently writing my own exporter and want to add an info text to my export options.
Inspired by the obj-Exporter i use the ExportHelper class as a basis. Sadly I could not found any good information on how this actually works. From what I can see, it uses
context.window_manager.fileselect_add(self) to open the file dialog, which will then automatically show all the properties of my class.
However I would like to have a bit more control over the GUI of my exporter. Is it possible to add more kinds of control element, just like in a panel? Like a text that explains some details, or a button that performs an additional action.