Its sadly not, I believe it will be included in version 29
pixel-scroll-precision-mode is in the mainline (Emacs 29), but didn't make it into Emacs 28.
If you're on a Mac, the railwaycat port has the equivalent already.
In addition to the native pixel-scroll-precision-mode in Emacs 29,
there's also a MELPA package called good-scroll which implements pixel-wise scrolling for other emacs versions also.
d12frosted/emacs-plus/emacs-plus@29 on Homebrew is my fav way to install master on a Mac. Trackpad scrolling is smooth even at 120hz.