it's been bundled with Resolve for a few years now, look for "neon suppresion" CLF,
it needs to be in linear light so apply to the cam orig in the media pool, or use a transform node to go to linear->use a neon suppresion node->use a transform node to go back to ACEScct
but if you want the orignal, or really anything to do with ACES, then go to:
https://acescentral.com/and read everything you can