Can someone create mod like Diablo 2 Zy-EL or something like this?

Grim Dawn Modding - Projects
2

Welcome to the forum. :slightly_smiling_face:

Modding tools are available and there are guides on how to do things to make mods here.

Grim Dawn’s Modding Tools + User-Generated Tutorials to Get Started - Grim Dawn / Modding - Tutorials and Help - Crate Entertainment Forum

There is already a D2/1 mod called Reign of Terror.

[Mod] Reign of Terror - Grim Dawn / Mod - Reign of Terror - Crate Entertainment Forum