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Darktable stores 'catalogs' in SQLite tables. When I poked around for fun with sqlite3, the schemas seemed relatively straightforward. If the catalog data from lightroom can be wrangled into a reasonable format, it may be possible to convert it (famous last words).

Lightroom catalogs are SQLite tables too, although using convoluted schemas.

It's really not that bad, you open your photo and it has a list of plugins you can use. Lightroom isn't the most complicated in the world either, I guess, so it's not going to be a very steep learning curve.

Maybe that could work:

"Allow to import/export tags from Lightroom keyword files"

(Release notes)

Then we just need

"Full support for DNG files"

Tags should be simple to transfer, but actual image corrections do not move over. That's the real issue, a decade of corrections being lost :)