You're adding metadata, but what problems does this added metadata solve exactly? If your converter can automatically compute these image features, then AI training and inference pipelines can trivially do the same, so I don't see the point in needing a new file format that contains these.

Moreover, models and techniques get better over time, so these stored precomputed features are guaranteed to become obsolete. Even if they're there and it's simple to use in a pipeline and everybody is using this file format, pipelines still won't use it when they were precomputed years ago and state-of-the-art techniques give more accurate features.