Hi
I have been using Lightroom for long time in past. That time, I used to save catalog in a single file with lrcat extension… I have see this article: Importing Lightroom Development but I need to import single catalog file into Darktable.
but I need to import single catalog file into Darktable.
Why ? The xmp contain all necessary information.
As long as you’ve saved xmp’s. (Please do so now). And LR doesn’t seem to put pick/not picked data in the xmp’s. Had the LR catalog go south on me once, and that’s all I seem to have lost. One of LR’s many annoyances.
Welcome to the nice world of non free software 
The .lrcat is an SQLite DB, so you may want to explore it and create “fake” .xmp out of it. But that would be certainly a huge amount of work.
Did you save meta data to XMP? If not, get a copy of LR or borrow a friends, load up your catalog, and do a save to generate the XMP files.
So tehnicaly, as of now, there is no way that Darktable can detect and import data from lrcat into darktable.
I have sent a feature request to dev team for issue: Import Lightroom catalog from lrcat file · Issue #4986 · darktable-org/darktable · GitHub
tnx
Sorry, but nobody is going to do that work, because the work has already been done to convert the XMP files. Grab a copy of lightroom and save the XMP files.
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Install lightroom and configure it to save xmp.
If you dp no have original version you use, you can suscrive for a month and do the work.