There is no AMA plug-in for DNG that I know, nor one in progress that has been announced. The concept behind AMA is that the camera manufactures create the plug-in. In the case of RED, Avid actually develops the AMA plug-in, not RED. With the RAW settings, I suspect Avid would need to do this work but I could be wrong.
DNG right now is done via Resolve. My presentation on DNG from a few months back spoke spoke to the metadata challenges of the long camera file names being used in Media Composer that truncates after 32 characters for any ALE merge of the metadata or EDLs.
Michael