I’m grouping e-mails with extracted attachments via groups. Groups obviously don’t standard metadata such as the “From” or “Recipients” metadata - although it does support custom metadata. It would be very helpful if groups could also support “standard” metadata (via AppleScript) such as kMDItemAuthorEmailAddresses
(or any field). This way we could see the relevant data for a group in the list view. The threads view does this automatically: ‘filling’ the colums such as ‘To’ or ‘Recipients’ based on the sub-items (it can do it automatically as all sub-items are e-mails).
I understand this might be niche, but as custom metadata is already supported, support ‘standard’ metadata would also be very helpful!