Backlinks for Columns (see all formulas referencing a given column)

I remember seeing someone else suggest something very similar to this before, but I can’t find it now.

For canvas formulae and buttons (and most/all controls?), I can click a little link button to see all other formulae referencing that formula or object.
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The Doc Map is wonderful. You know what would make it even more wonderful? If columns would show up there instead of tables, and vice versa if I could see see all backlinks (references) to a given column by clicking a similar link icon in the context menu or column settings.

I would find this very useful as I am editing the schema of tables with many many columns… sometimes I know that I can and should reduce the number of columns (eg because of redundancy) but then sometimes it’s tough to find exactly which column(s) I can delete.