increasing parameter stack size in Piketec TPT for C++ testing

I am using Piketec TPT for testing a C++ project and i have an input struct which is quite large in size (~600kbytes). when I try adding the input in the channel during the definition of the test cases then it results in a parameter stack overflow. I cannot individually pass the members of the struct in the channels due to another tool restriction which requires the input struct as it is.

Does anyone know how to increase the parameter stack size on TPT?