Hello @Sam_Biswas and welcome to the forum!
There are some good inking brushes in Krita, for instance inthe following bundles:
Currently, the best you can get: INK brushes for INKTOBER 2023
Wavenwater Concept art traditional medium Beta
Mikhailasmo’s Inking Brush Set
And this collection of brushes and bundles from @fizzyflower holds a bundle with the Rudluff pens, and they are a wonderful choice for lineart: Fizzyflower’s ULTIMATE MyPaint Brush Collection, look out for this download: “My Paint Bundles: ← or use this link directly 
” if you follow that link, double-click the folder Google shows and look out for the “Rudluff_MyPaint.bundle”, it can be worth the hassle.
Maybe these pens too:
Ink Pen (CSP-like)
Replicating CSP’s Nacho-Pen For Krita
My attempt at fountain pen brush
Michelist