I use Anti Slip tape, doesn't have to be this brand but it's what I got
https://www.amazon.com/LifeGrip-Resilient-Non-Slip-Traction-Comfortable/dp/B07PZFBG22/ref=sr\_1\_2?crid=N0NA1F7V5MTG&keywords=lifegrip+Anti+Slip+tape&qid=1649025858&s=home-garden&sprefix=lifegrip+anti+slip+tape%2Cgarden%2C90&sr...
It's pretty aggressive like actual knurling. Just don't overlap the tape onto itself, won't stick as well, if at all.
I used this stuff. It's like bumpy knurl lol. Better than some passive bars actually. Hockey tape would be good too.