Has anyone figured out the data format for NSAdaptiveImageGlyph yet?

It looks like it might be the only way to pass images embedded in text to system views and have it be scaled appropriately. Which would allow Mastodon clients to finally include custom emoji in notifications…

Except they can only be initialized from Data, in some format Apple didn't document beyond “contains the image data, the unique identifier for the image, the image description, and additional metadata”