Marking or deleting some items

I did some test runs of my NER model over sample data and imported labeled data into Doccano.
I want to find those items where labelling is missing, add labels and mark them for export.

Generally speaking I want to skip those item which are correctly labeled and export only items with handedly corrected or missing labels.

I see that there's a metadat column but it is only can be filled externally, another option would be to delete all good-on-import labeled items but there's no delete button inside annotation view.

Am I missing some possible options here how to do what I want?

Your Environment
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* Operating System: OS-X
* Python Version Used: 3.11
* When you install doccano: today
* How did you install doccano (Heroku button etc): docker