Adding labels to merged foto's

Question
1

I was wondering if it is possible to add a tag to a single photo in a merged item.
For example: I have personal files containing different documents of multiple photo’s Firstly I want to merge the photo’s beloning to one person/file into one item.
Then I want to label the item (the file) , as well as the individual photo’s/documents differently.
merged Item = file of Person x
photo 1= birth certificate
Photo 2= passport
photo 3 = baptism record
photo 4-6 = letter/correspondence

I want to create labels per photo. For example label to indicate I transcribed photo 3 and a label saying I am in the process of transcribing photo 1.
Now it just assigns the label to all the photos in the item. Is there another way to do this?

2

Currently labels can only be attached to the item; we’re probably going to allow tags at all levels in a future release.

(What you can already do is attach metadata fields at the photo level. So for example you could add a dc:type field to each photo.)