A ScriptableObject that if you put it in Resources folder, you can use a static property .Get to load it at runtime to a static variable space! But you have to name it exactly like your subclass name. It uses typeof(T).Name to get the name of your class at runtime.

The static variable is cached automatically on the first load. Subsequent .Get does not call Resources.Load again.

You could combo with "Odin Inspector" to make a "game settings" with good UI in editor, then you could request its value easily at runtime. Note that things in Resources folder is not difficult to pry and hack by players.