Add metadata to build artifacts

Hello,

Is there a way to add a custom metadata (like XML) to build artifacts in TeamCity ?
We would like to add such metadata to artifacts and then query by it.

The metadata may be a label/tag (I know it's possible to "tag" the whole builds in TC today and use them as Gmail lables later) or a more complex XML file and it may be applied to a specific build artifact and not the whole build.

Thank you !