I believe that's not possible or at least I don't how to do that
To access that information with a script (either server or client side) you'd need the user's authorization
Manually, you can mouse over the email address in your datasheet
- and right-click the user's image to get the image address, if the user has a photo
- but that might be a temporary Url as it's based on googleusercontent server
Optionally, and this is a wild guess,
- you can add all those emails as Contacts with an specific label and then
- let us know if that works, just in case it can help others