I'm betting this is way beyond Sheets' capabilities, but my workgroup is large and changes frequently. It would be ideal to be able to share Sheets documents based on a column of values in another (or even the same) sheet.
Column A B x firstname.lastname@example.org email@example.com x firstname.lastname@example.org
A check of column A would yield 'ashley' and 'charlie' for the sharing list.
Even remotely possible?