The same way Dolby Vision has kind-of enforced better color consistency, I imagine grain could be done as well. One could call it something like Dolby Vision F

The same way Dolby Vision has kind-of enforced better color consistency, I imagine grain could be done as well. One could call it something like Dolby Vision Film Enhancements, that would just mandate decoder support. Those who don't support it get a fallback, like the usual.