[Feature request] JXL format support

[ThreeDeeJay]

I've been looking for the best format to re-encode stereo 3D images efficiently.
After testing and comparing several formats, I settled with WebP Lossless (which is already supported by sView), but for lossy JPGs, it's better to use JXL which can do bit-exact recompression of JPGs which allows saving space further without losing any more quality.
However, when attempting to open a JXL file, I get this error:

I'm not sure if I should've requested support for this format here, because it seems ffmpeg might already support JXL https://github.com/FFmpeg/FFmpeg/search?q=jxl&type= but in reality the implementation doesn't seem finished or included yet

JXL examples: https://www.dropbox.com/sh/abo1fh4plao1szq/AAD3Y20j6si2XKQ58kjxNc90a?dl=0
JXL library: https://github.com/libjxl/libjxl
JXL info: https://jpegxl.info/