This was already partially referred here more than 2 years ago: Dolphin not displaying data in audio-related columns It turns out it is not only for audio it is not working. Because it is quite a useful function shouldn’t it be addressed by KDE already? Is that solution really recommended? After a…

Plasma’s Baloo file indexer works fine. There have been a lot of improvements to it over the past couple of years. Why not just enable it & see how it goes? You can always disable it later.