Does anyone know whether it is possible to define custom parameters based on existing parameters in SW flow simulations for post-processing/visualization purposes?

For example: I am simulating the injection of fuel to a volume filled with air. I have the volume ratio of both fuel and air for my entire domain provided by SW. Is there a way I can get to the equivalence ratio? The equation would be simple.

I could do this for single points or solid surfaces using equation goals, but I see no way to achieve this for, say, a cut plot.

At the same time, there is no way of exporting 2D or 3D data from SW flow simulation, right? That would at least give me the option of doing this externally.

Thanks for your help
Niclas