Optional flag for image backup drive letters?

When specifying directories to back up in File Backups, there are a set of Flags available, including one to make a path optional so the job doesn’t error if the path isn’t available on a particular client.

Is there a similar feature for Image Backups? I have a group with numerous Windows clients in it. The group is configured to do Image backups of D: and E:. However, a couple of the Windows clients don’t have E: and the job errors for them. “ALL” is not a good option for me because I specifically don’t want to back up C: in this group.

It’s inconvenient to make separate settings for these clients just to omit E:. It would be much easier if I can just indicate E: is “optional”. Documentation doesn’t indicate this is possible, but hopefully I’m just missing something.