do you mean a whole sphere, or half of one?
A whole one needs 2 sided work (since you can’t really cut the bottom half in one go)
You can grab an stl of a sphere from https://commons.wikimedia.org/wiki/File:3d_model_of_Sphere.stl or https://www.thingiverse.com/thing:156207/files and follow the tutorial at Cutting STL models with Carbide Create Pro (nearly-2021 edition) (with 50% depth offset) to easily create the half sphere.
the hole through the middle you can then do with a traditional normal toolpath in addition