[NTG-context] Table of content

Dear ConTeXters, At the moment I am bit at a loss. I should prepare a document, wherein there will be a difference between one chapter title and the respective row in the table of contents. What it should become looks as follows: \chapter{This is the title of the chapter} In the table of contents it should show up as: Epilog: This is the title of the chapter So the question is, how to get the word Epilog into the table of contents in front of the chapter title, neatly aligned with the rest of the table of contents. Cheers Willi