Apart from the HTML5 export mentioned by another commenter, there exists Ruffle[1], a Rust + WASM reimplementation of Flash that can play swf files. It's used a lot on archive.org or on some websites like https://homestarrunner.com.
They may but note that this isn't an official Newgrounds project - this is just a user ("Bill") posting on his own Newgrounds blog that he has made this (its not Newgrounds' official blog).
Is it targeting the web? If not then it's not going to be useful for the same things as Flash was.