closed loop transfer function

Is there a way to use tfest or any other built-in function to estimate the parameters of a closed loop transfer function? It seems like MATLAB only offer solutions for open-loop transfer functions to me. Thanks.

[Walter Roberson]

https://www.mathworks.com/help/ident/ug/building-and-estimating-process-models-using-system-identification-toolbox.html#zmw57dd0e21197 ?