is there a way to select a terrain from the project folder?

i would like to set a terrain not in my scene to a variable so i can load it from my project folder. i tried var newterrain : Terrain; and that works for terrains in my scene but i cant set it to a terrain in my project folder. is there a way to do that?

you must have the terrain in the resources folder to load.
stuff not assigned in a scene and not in resources is not present in build at all

well i can load prefabs from the project folder even if they are not in my scene i was thinking i could load other objects the same way. maybe i will just put the terrain in a prefab itself