No, there's no tool for that yet. It might not even be possible - API access to C3D styles and labels is still quite weak. I suspect it's one of those things where it would be possible to get it working for maybe 80% of the C3D entities, but I'd have to start digging into it to find out.
It's something that's on the list, but there's some even more-useful things ahead of it.
And actually, a tool that merely IDs the layer isn't all that useful for people who have been using C3D for a while. The useful thing will be new Layer Tools - the equivalent of "Layer Off", "Layer Freeze", "Match Layer", etc. - that work on the apparent layer of C3D entities, rather than the Object Layer. But once one of these tools is working, it's relatively easy to do the rest. The hard part is digging through the morass of styles in C3D, which isn't easy (both because of the design of C3D, and because of the current level of API access to C3D).