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

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