https://www.techpowerup.com/289267/amd-fidelityfx-super-resolution-fsr-plugin-for-unreal-engine-4-released
 
AMD released the FidelityFX Super Resolution (FSR) plugin for Unreal Engine 4, allowing game developers to integrate the performance enhancement technology with their games. A competing technology to NVIDIA DLSS, FSR lets gamers improve frame-rates of their games by trading off quality. At the higher "Quality" presets, this quality loss is supposed to be practically unnoticeable, but with significant improvements to frame-rates. We detailed how the technology works in our article that gets under its hood and evaluates performance. At its launch, AMD listed out a broad list of launch partners for the technology, but Unreal was a notable absentee. Over the following months, AMD appears to have worked toward bringing the tech to even UE4. The plugin is being distributed through AMD's GPUOpen portal.
 
I'm sure this plug-in was well worth the wait.