Altering .usf files to work in packaged game build

I’ve been tweaking the ScreenSpaceReflections.usf file located in the Engine/Shaders folder to get better looking reflections in my project. However when I make a packaged game build, it does not use the .usf file that I have tweaked but instead uses the default one.

I noticed my build folder has a similar folder structure named WindowsNoEditor/Engine/Shaders but it does not contain any .usf files and simply dragging the altered .usf file does not seem to do anything.

Is this possible in any way to make my game build use the .usf files that I have altered.

Did you manage to do it ?
I’m looking for exactly the way to define what " SSR_QUALITY = 4 " is defined by.

Let me know.