Lightroom or an alternative that supports/imports LR hierarchal keywords

Lightroom is the last holdout in apps that I can't yet replace with a linux equivalent, That being said, it's not the photo editing aspect I'm looking to replace, as there are lots of tools out there for that. What I'm having trouble replacing is the photo organisation aspect, and more specifically, something that supports/imports Lightroom hierarchal keywords. I've got nearly 20,000 keyworded photos collected over decades, and at the moment, I'm largely chained to Lightroom to keep them organised.