how can I lock a mark (or a marked duration) in the timeline ?

Hi,

I added several marks with duration on my timeline to identify the different parts (it's a video clip so my marks show "intro", "verse", "chorus"..). But when I make an insert edit, it pushes these marks so I constantly have to readjust them.

Is there a way to lock these marks so they are not affected by inserts edits ?

Thank you for your help !