There are a few here:
Resources — Krita Manual 5.2.0 documentation
Some of them may not be provided as ‘bundles’ (easy one step import) and so would require individual importing of resources withing them.
On this forum, there are hundreds of brushes (and other resources) created by forum users and offered for download via links.
Here’s just one of them:
FizzyFlower's "ESSENTIAL" Brushset VERSION 2 ⭐ with 400+ Brushes ((Cloud, Paint, Hair, Fur, FX, Foilage, Trees, Leaves, Texture, Smudge, and more!)
And here’s another:
Rakurri Brush Set V2 - Free Krita Brushes 😁
The forum is full of Resources: Brushes and Bundles topics where users offer their creations for downloading.