How to set material's "IncreaseOfShearStrengthWithDepth" value through Python

Dear Soilvision experts,

I am using Plaxis 2D Version 21.01.00.479 through python scripting. I would like to set an Su increment value for a Mohr-coloumb material. I checked the command reference (through Help tab), it says the right command is called "IncreaseOfShearStrengthWithDepth". However when I tried applying to the python script, it gives a "PlxScriptingError: Unsuccessful command: Unknown property: IncreaseOfShearStrengthWithDepth" error. When I tried to input the value directly in Plaxis 2D, I can't find the term "IncreaseOfShearStrengthWithDepth" at the command line (at the bottom of the scree) either.

Is there a way to include this "Su inc." value (or other parameters that are not included in the command line but are included in the command reference) through Python scripting?

Thank you for your time and attention, I am looking forward to your assistance.

Kind regards,

M. Rayyan