please tell me how to procedurally generate structures!

in a recent forum post, i asked how to use jigsaw blocks to create more diverse and interesting structures, and i was told that mcreator apparently couldn't use jigsaw blocks in structures, so i posted this for two answers.

1. is this true? is there no way that mcreator can generate structures with jigsaw blocks without using custom code?

2. if 1 is true, what procedures do i use to procedurally generate structures?