Predicting several target variables. Searching for input parameters that maximize target variables

Hello, I'm making machine learning model which predicts two mechanical properties of the printed sample (talking about SLM machine here). My model is trained on 7 input parameters and should return 2 target variables. Moreover, I want my model to tell me which set of input parameters gives the best combination of 2 target parametes. Specifically, low porosity and high hardness.

How can I do that in MATLAB? Should I use Global Optimization toolbox? If so, how can I insert my set of parameters (which contain categorical variables) into the optimization algorithm?