So here is a issue were currently darktable don't support cr3 files. so what we can do about it.
use a program that supports cr3 files and convert it into something that darktable does understand. for that we gonna use RawTherapee.
----------------------------------------------
Download RawTherapee from here
https://www.rawtherapee.com/
If you have any doubts please let me know in comment section
-----------------
After almost 3 years it is first time I am using my vocal so please let me know what you guys think about it.
-------------------------
there is also another method using adobe dng converter but it does not support linux need wine to be installed to use it. so I think this will be the best method.
----------------------
[Update ]
Here is another method for converting cr3 files into dng format.
using https://github.com/dnglab/dnglab