Describe the bug

When exporting a image to JPEG XL format (10-bit, HLG Rec2020 RGB color space), the image does not include any metadata (EXIF data for example).
I have tried enabling all the boxes in the export preferences.

Steps to reproduce

1. Switch to the Darktable tab
2. Develop an image (scene-referred (sigmoid) workflow used)
3. Open the export tab on the left
4. Select JPEG XL format and select 10-bit as bit width
5. Open export preferences and tick all the metadata boxes (optional step)
6. Press the export button
7. Open the resulting image with an external software (loupe image viewer used)
8. There is no metadata present

Expected behavior

darktable should include the metadata when exporting a JXL image.

Logfile | Screenshot | Screencast

darktable_log_jxl_metadata.txt

Commit

No response

Where did you install darktable from?

distro packaging

darktable version

4.4.2

What OS are you using?

Linux

What is the version of your OS?

Fedora 38

Describe your system?

No response

Are you using OpenCL GPU in darktable?

I dont know

If yes, what is the GPU card and driver?

Intel® HD Graphics 520 (SKL GT2)

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

• Can you reproduce with another darktable version(s)? yes with version 4.5.0+815.g80b5c9e0e8 (AppImage)
• Can you reproduce with a RAW or Jpeg or both? RAW-file-format
• Are the steps above reproducible with a fresh edit (i.e. after discarding history)? yes
• If the issue is with the output image, attach an XMP file if (you'll have to change the extension to .txt)
• Is the issue still present using an empty/new config-dir (e.g. start darktable with --configdir "/tmp")? yes
• Do you use lua scripts? no