How do I use the in-built roblox terrain generator with scripts?

There is no Yield Function for it, but if roblox has a plugin (like with the animation editor) then I can use InsertService and copy the generation code.

idk but if you want to make your own custom terrain then

you could make and inviable custom terrain(like 5 of them) and then do:

local terrain = math.random(1,5)
if terrain == 1 then 
game.workspace.terrainone.transparency = 0
end
if terrain == 2 then 
game.workspace.terraintwo.transparency = 0
end
if terrain == 3 then 
game.workspace.terrainthree.transparency = 0
end
if terrain == 4 then 
game.workspace.terrainfour.transparency = 0
end
if terrain == 5 then 
game.workspace.terrainfive.transparency = 0
end