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).