show "related" in middle pane

I would like to have an option to see whether an item has a related item in the middle pane. This could be triggered by something like the "+" symbol to add additional colums displayed in the middle column.

Reason: I have relatively few items with related items and it is cumbersome to click the related tab to see whether there is a related item.
ideally, one could even click through the related item from the middle pane. Like this one could open the notes section and click to related items always viewing notes.
also see my request for increased display of notes and attachments in middle pane:
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