I never encountered jxl in the wild so I don't know which apps support it, but if somehow you found a jxl file and don't know how to view it, this one works:
https://apt.izzysoft.de/fdroid/index/apk/fr.oupson.jxlviewer
I never encountered jxl in the wild so I don't know which apps support it, but if somehow you found a jxl file and don't know how to view it, this one works:
https://apt.izzysoft.de/fdroid/index/apk/fr.oupson.jxlviewer