In fact here is the text file format I need Metro to export from its markers:
{QTtext}{font:Geneva}{plain}{size:12}{textColor: 65535, 65535, 65535}{backColor: 0, 0, 0}{justify:center}{timeScale:25}{width:160}{height:48}{timeStamps:absolute}{language:1}{textEncoding:0}
[00:00:00.00]
{textBox: 0, 0, 50, 160}Prologue
[00:00:30.03]
{textBox: 0, 0, 50, 160}P02 I
[00:00:54.12]
{textBox: 0, 0, 50, 160}P03 Il
[00:01:15.00]
{textBox: 0, 0, 50, 160}P04
[00:01:34.12]
{textBox: 0, 0, 50, 160}P05
[00:01:47.10]
{textBox: 0, 0, 50, 160}P06 111
[00:01:59.24]
{textBox: 0, 0, 50, 160}P07 IV
[00:02:26.02]
{textBox: 0, 0, 50, 160}p08V
[00:02:42.10]
{textBox: 0, 0, 50, 160}P09
[00:03:19.17]
{textBox: 0, 0, 50, 160}P09 Vi
[00:03:23.24]
{textBox: 0, 0, 50, 160}p10
[00:03:32.12]
{textBox: 0, 0, 50, 160}P11
[00:03:43.21]
{textBox: 0, 0, 50, 160}p12 VII
[00:03:55.11]
{textBox: 0, 0, 50, 160}p13
[00:04:02.23]
etc...
the markers were:
Then I import that text into QuickTime player Pro , I copy the result and paste it inside the movie. With Command+J I transform the text track into Chapter. Now I can use the chapter function inside my movie.