Hi,
I am already using Gnome, and thinking to install cachyos-hyprland, Is there any better way to install it with Gnome?
What do you mean better way? You can just install the needed hyprland packages and then swtich from SDDM to Hyprland session.
What do you mean with “install with GNOME”?
GNOME is just a desktop environment, one of several, like KDE Plasma, Sway, Xfce or Hyprland and a dozen more. You actually do not even need one.