WP admin pages - orderby counter

Hi,
Is there any way to sort the post in the WP admin lists by the counter column? It is not clickable at the moment.
Will it be available in upcoming versions?

I not, I would like to add the sort by myself, but for it I have to know the key of this meta data in the DB, and can't find it by myself. Can you please help me with that?

Thanks
Annie