I'd really love Emacs to have native JPEG XL support. For I use Emacs as a pictures viewer and the only thing preventing me from converting all my family pictures from JPEG to JPEG XL (it's a 22% saving which results in JPEG XL files that can be converted back, bit-for-bit, to the original JPEG file) is the lack of Emacs support for JPEG XL.

Does anyone know if it's coming? Anything in the JPEG XL or JPEG XL libs license that makes it a problem to incorporate in Emacs?