Additional item in Cahn-Hilliard equation

[Nuwanted]

Dear MOOSE experts,
Would you be kind to let me know how to add an additional term in the Cahn-Hilliard equation in MOOSE? It is equivalent to superimposing the AC equation with the CH equation.

I want to solve the Cahn-Hilliard equation in split form after adding the additional item, how should I modify the kernel file? Is it modified based on the CoupledTimeDerivative kernel file?

I would appreciate if you could manage time to reply.

Thanks, and best regards.