I improved the tool and added an indicator for archived projects. This is a paid feature but it can really simplify your life as an Asana admin when doing some cleanup!
It is crucial to export that list otherwise you’re gonna learn the hard way that Asana does not have a change trail for custom fields! I added a notice on the tool page saying you can simply export by saving the webpage (Ctrl+S, Cmd+S).
Did you ever consider using align to top for all cell content? When a custom field has either lots of option values or lots of projects using it, I think it would be more readable that way.
Also, in large orgs, the Projects column can have lots of projects for many custom fields which makes the output hard to read, so maybe listing them comma-separated instead of one row for each could reduce the overall size of the report.
Maybe those two things could make the report easier to read for large orgs?
And a big ask for the future roadmap would be a CSV (like you offer for Overview). You’d have to collapse some columns (like Options and Projects) to fit in a cell, but perhaps commas would work, or quotes to handle newlines within cells.
Knowing who is the creator of a field is really useful if they leave the company: it will allow you to identify which field’s ownership should be changed!