The fan-made port is called Doom3Quest, and comes with more than 12 hours of campaign content alongside updated graphics. You can also expect fully tracked VR weapons and VR UI touchscreen interaction, among other things, to make the experience worthwhile on your Oculus Quest. You can only play the single-player right now, but the team behind the port is open to the possibility of looking into multiplayer at a later date.
If you fancy giving Doom3Quest a go yourself, you’ll need a copy of the original game and a third-party app called SideQuest. The desktop app is designed to simplify sideloading apps and games on Oculus Quest and Quest 2, so it’s recommended you go with that. You can find more information on how to install the port over on the Doom3Quest website.