How can I model this common mode choke in circuit in LTspice?
At reasonably small currents, a common mode choke looks like a 1:1 transformer with a resistance in parallel with each of its inductors.  You can get very close to correct by looking at the impedance vs frequency graph.
At low frequencies, the impedance rises like an inductor.
Use that to get an inductance value.
At some high frequency, the inductance maxes out.
Presume your inductance and compute the resistance.
This will be good enough for most models.