Pretty sure it was supposed to come in a dot upgrade of Xcode 13 (and the very basic create part was in a beta if I remember correctly). As there's also no sign of it in Xcode 14 betas it would seem like it has most likely been abandoned, which is kind of sad

Don't know if it's any help in your case but notice that you can insert a filter at the linear stage via the kCIInputLinearSpaceFilter option