While I can’t add features directly to your file, I can suggest the you can easily add to The Simpsons Season 06 MKV files: embedded chapter markers for each segment of the “Who Shot Mr. Burns?” two-parter (Part 1 is the season finale of S06).

The Simpsons - S06E25 - Who Shot Mr. Burns (Part One).mkv Media servers will then fetch summaries, guest stars, and even link to Part 2 automatically.

Would you like a step-by-step command line for adding chapters or cover art to your existing MKV?