I've not used them myself but there was an effort to group these kinds of libraries in a common 'SciNim' community:

https://github.com/SciNim https://scinim.github.io/getting-started/

Generally, projects created by Mamy Ratsimbazafy (mratsim) are a good start since he's very adept at optimisating data science-related libraries.

You might want to ask in the #science channel of the Nim Discord server since although it's often quiet, that's where people working on these repositories hang out.