#6367 adds support to import JXL images. It was opened a few years ago, but progress stalled because of missing dependencies. A PR to add export capability was never created because the same issues holding back import would have blocked export.
The dependency issue was recently resolved, so now anyone who’s interested can try the workflow artifacts.
Scroll to the bottom of the PR page. Click “show all checks”. Then click “Details” for the workflow that matches your operating system. On the left sidebar, click “Summary”. The download links should be at the bottom of the next page.
The PR workflows are put on hold whenever I push a change, so the downloads aren’t available until someone approves them. Another source of artifacts are the workflows from my working branch.