Searching for words added in translation

https://community.logos.com/forums/t/158670.aspx raised the question as to how to identify words added in translation.

Neither KS4J nor I (referencing an earlier reply from Dave) could come up with a nice solution.

However, these are identified as "Supplied" in the Propositional Outlines Visual Filter

It is not currently possible to search for "Supplied" (for reasons I think I understand - the word isn't there in the original language) but it would provide a nice solution to this if it were possible.

What would be involved in making this work? Is it feasible in any way?

Thanks, Graham