MehranGul

Loading Unity Scene
Loading Combatant Prefab
Prefab preview Prefab for combatant

and other such assets and prefabs. may be also the ui prefab.

I have seen Asset Bundle options in different places. Is there an official implementation for Unity Addressable?

https://docs.unity3d.com/Manual/com.unity.addressables.html

Also. Please confirm the feasibility and some tutorial to make custom plugin for overriding your default asset bundle functionality. I can write code for Unity Addressable; but will it work with ORK/Makinom? Will i be able to overrride the way it loads assets?

gamingislove

There's currently no official support for addressables.
You can add a custom asset source type via script without changing the source code. You simply need a script extending from the BaseAssetSource class, see the documentation on code extensions.

I'd recommend to check out the built-in asset source code, e.g. for the asset bundle implementation. You can find this in the Makinom source code.