Apologies for reviving the old thread, but I thought I'd give some input as one of the contributors to libjxl.

There's multiple decoders now, in order of completion libjxl , jxl-oxide and jxl-rs (WIP) . All are open source, with the creators of the format stating the Google patents and ISO spec are ...

also agree that this should be a feature, ive spent at least 2 hours just trying to remember what my toolbar was

same problem as everyone else