Hey pijun,
I have no experiences with Fedora GNU/Linux although I am an GNU/Linux user since many years. So I can not help here and I even found nothing with my favorite search engine.
But you can have a look here for the minimal hardware prerequisites and it looks like that your Windows 11 machine has a little bit too little memory (maybe you could use this case for a little clean out? ;) ): https://grapheneos.org/install/web#prerequisites
But do you know that you can install GrapeneOS from one Android device to another (after ? I did this using Bromite browser with an Pixel 3 XL to my current Pixel 6 and the original USB C to USB C cable. It worked fine.
All the best, malatoi