Way to correlate layer with scene number in imagemagick.

[powerc9000]

So the exporting of this tool is pretty slow so I want to use image magick to export. However IM has no knowledge of groups and I use groups to help name the finished product. In imagemagick you would do convert file.psd[0] where 0 is the scene number. I tried to do it via the index of a layer or the layer id but neither of those line up correctly. Is there some number I can use that would work with how IM exports images?