Calculation Z for Legancy addresses is simple. I need the calculations of Z for P2SH Witness Transacons.
For example this one?

TestNet TxId:  ac919ea7cd1564fe0826851076041d58185b2ca04f2305f22dd60b63ac476913
Adresse:         2NDRD773hJ2aJNNgKNH45CYCzPWQmL6vs5a