Album mode? With indexing?

Sorry for the messy conceptualization, but i am wondering if there is such a thing as an "album mode" in JPEG XL? That is, a way to put several images into 1 file, and have the compression benefit from similarities between the images? I know that really doesn't work with photos, but I was thinking more of screenshots and pixel art.

Yes, there is support for animation of the sort animated GIF supports, but I was thinking more of a mechanism for waiting for the user to press a key or click before showing the next image. Also might be nice to accept a simple integer parameter indicating which image within an album to retrieve or display.