Hi,
For power supply design under the S32G2 platform, there is an Application Note (AN13299: S32G2 Power Estimations Application Note) we recommend looking.
As for "power supply values and voltage fluctuation range", could you please elaborate more on the details? The datasheet shows the voltage needed for the specific power domains and the range they should stay between [Table 4, Page 13, S32G2 Data Sheet, Rev. 6, 12/2022].
Please, let us know.