Excel Writer: Dynamic Row and Column using Template File

I have an Excel report template in which I need to update specific row/column fields and they are not in consecutive order. In other words, I want to update Row1,Column3 and then Row10,Column8, etc.... Is there a way to dynamically set the Start Column and Start Row parameters within the Writer Format Parameters? I tried, with no success, creating Row and Column attributes and then setting the parameters within the writer as @Value(Row) and @Value(Column). Or is there a better way to do this when using a template for a Writer?