So, I know that you've just added ProRes to the Quicktime container. And, that is without a doubt very great! The thing is. When you export, it does not save you color space and any HDR metadata. That is very annoying, when you want an archival file with your HDR grade with Rec. 2020 color primaries. In AE you also does not have the option to embed a color space and no HDR options either. It only exports in Rec. 709