How to get Chapter Numbers in PDF Index?

[PeterHeintz]

Hi,
I use the EA document generator to directly generate PDF documents and in principle all works fine.
My table of content within the PDF shows the document chapters with chapter numbering.

However when using the “index” feature ( the PDF reader feature which shows the chapters in a kind of a tree, I only see the chapters without chapter numbering.
Does anyone know, how to get also the chapter numbers visible withing the PDF reader index feature without any post-processing via e.g. MS-Word.