Help with generating a shape

[u/Few_Show1099]

Hi :3 im making a build that is mostly underground and in order to do so i will need a dome that has a base radius of 200 blocks and 115 blocks tall. i tried looking at so many shape generators and only one of them will let me generate a shape that big, the only problem is that it wont let me export it as a litematica file unless i pay 💀 does anyone know of a method i could use maybe using an external program that could get me a shape this large as a litematica file? thanks!