You either can use the VLOOKUP and ignore that fact that's there's a PIvotTable in the cells, like this:
=VLOOKUP("My Value,A:D,4,FALSE)
Or you can use the GETPIVOTDATA function. I'm not exactly sure how you are wanting to combine the formula & function. If this didn't help, could you give an example of what you have and what you would like to see?