How to leave a comment at a certain point on the timeline or by specifying a time range

Question

Is there a way to specify a time range on the timeline and leave comments?

Answer

Add a marker on the edit page or cut page, then double-click on the set marker to leave a comment.

Keywords can be set here, but they do not appear in Smart Bin search targets.
What will it be used for? I wonder if it will be supported in the future.

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