You could load the excel and then pick from this load your needed fieldvalue respectively concat and/or aggregate multiple columns/rows and assign it to one or several variables and use them to perform your real loadings. It's quite the same like the content of the include-variables - and it must contain valid code.
Depending on the complexity of the code and the way how the code is stored in columns/rows it might not very easy to implement such logic. Therefore what is the reason for not using a Qlik application and/or include-variables?
