CRF toolkit with label-specific features

Can you recommend a sequence tagging toolkit (e.g., some CRF toolkit) that can use label-specific features?

Usually, features are generated from input words (e.g., word itself, word suffixes, "isCapitalized?", etc). I would like to do the same thing for labels (i.e., "suffix of the label").

In other words: usually, input-specific feature functions are combined with label IDs behind the scenes when generating actual features. I would want to combine input-specific feature functions with features functions applied to label IDs, not the labels themselves.

Background: I have a fairly large label set and this would allow me to create a sort-of label and feature hierarchy.