By “not support in the cml”, I think @aya_zaki actually means is that, for this particular model, there is no customized parameters. You can definitely build your own compact model of terminator with parameterized cells and adopt the automation API as well to make it customizable (launches the actual FDTD simulation when you tweak the parameters).The way to do so is to run several simulations to sweep through the parameter range you want to cover and save the s-parameter files for each of the sweeping points, then in the compact model, use a lookuptable to find the most accurate set of s-parameter to load in (pcell method). Or you can use automation API to trigger the FDTD simulation every time you change your parameter values (automation API method).
We will publish the LCML on KX later this month and both of the methods will be fully discussed into details in the corresponding posts. Stay tuned!