Create chapter markers in mp4 file with QT Player?

I think I may have asked this question before but I can't remember the answer!

I have an .mp4 file to which I wish to add chapter markers.

a. I feel it can be done using QT Player? If so, how?

b. Can chapter markers be exported from FCP X?

I have exported the video in FCP X to "Include chapter markers" but can't access them in QT Player.