https://puri.sm/posts/librem-5-photo-processing-tutorial/
Which is a pleasant read, and I like the pictures. Has the Librem 5's automatic JPEG output improved since you wrote the post about photography in Croatia (https://dosowisko.net/l5/photos/)?
It's still pretty basic compared to hardware accelerated state-of-the-art, but I think it produces decent output in a fraction of a second on the device itself, which isn't exactly a powerhouse: https://social.librem.one/@dos/115091388610379313
Before that, I had an app for offline processing that was calling darktable-cli on the phone, but it took about 30 seconds to process a single photo with it :)