IMHO it's too late for WMAS 2026 but we should consider JPEG-XL for WMAS 2027 now Firefox are enabling it.
https://www.phoronix.com/news/Firefox-JPEG-XL-2026-Plans
Also Google have an intent to ship.
https://groups.google.com/a/chromium.org/g/blink-dev/c/-gDojQbDPRI
and it's been supported to some extent in Safari for a while.
See also https://caniuse.com/jpegxl
IMHO it's too late for WMAS 2026 but we should consider JPEG-XL for WMAS 2027 now Firefox are enabling it.
https://www.phoronix.com/news/Firefox-JPEG-XL-2026-Plans
Also Google have an intent to ship.
https://groups.google.com/a/chromium.org/g/blink-dev/c/-gDojQbDPRI
and it's been supported to some extent in Safari for a while.
See also https://caniuse.com/jpegxl