I spent some time working with easel and watch a bunch of youtube videos. Everything I have seen so far is 2 dimension stuff like signs etc. Can easel be used to engrave on top of half a sphere.
No, not currently. For that you would need something else, like VCarve or Fusion 360. VCarve starts at $350. Fusion 360 is free for hobbyist use (<$100k/year income)