Extended Complex Kalman Filter Simulink Implementation

As I am aware of that Simulink support "extended Kalman filter" block, however I'm interested in implementing the "extended complex Kalman filter" using Simunlink. I don't think Simulink has a defined functional block for implementing the "extended complex Kalman filter" yet. Can anyone provide hints or examples that I may be able to implement it using pre-existing functional blocks, such as the "extended Kalman filter" functional block, etc?

Thanks!