Defining a nonlinear resistance in ADS

[PanosB_GR]

So...

I want to define a nonlinear resistance that:

1.its current function is dependent on the voltage across it (arbitrary power of it)
and also
2.is multiplied by an independent function of time (a polynomial of time).

i.e.: I(V,t)=P(t)*V(t)^a

Is something like that possible in ADS?

Regards