DiffBIR Stage 2 / IRControlNet support?

DiffBIR appears to use ControlNet models as its stage-2 models. (It's using SD 2.1; the ControlNet models appear to be conceptually similar to the Tile models.) It would be nice if sd-webui-controlnet added support for those models. The model weights are linked here. Currently the DiffBIR models raise this exception: https://github.com/Mikubill/sd-webui-controlnet/blob/56cec5b2958edf3b1807b7e7b2b1b5186dbd2f81/scripts/controlnet_model_guess.py#L292

If there's some documentation you can point me to regarding adding support for new model types, I don't mind giving it an attempt myself.