Is it possible to feed SystemTest Simulink model using buses with spreadsheet data?

Hi, Im using Simulink and want to verify my models using Systemtest. I want to have a testvector with data from a spreadsheet to feed the model. My models are using buses as inputs and outputs. I can not manage to feed my model with spreadsheet data using buses, but in order to do so I must put single inputs and outputs for my test environment. It works fine but it would be so much nicer if I did not have to modify my model in order to test it. Is it even possible?

Very thankfull for answers!