You might need to turn off "Filter Engineering Data" so the properties other than those needed for whatever type of analysis system you have on the project page are displayed:
Also, at 2023R1, if you open Engineering Data Sources, you'll find a number of predefined piezoelectric materials (poled in the z direction, I believe, and only for 3D models). Please see the image below. You can duplicate any of them and then edit the duplicate with your own material data.
If the version of WB that you are using is old, these options might not be available, and you would either use the Piezo and MEMS ACT or define the material properties with an APDL command object.
Best,
Bill
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