How can I set embedded data for a scoring category?

Hi all,
I'm having a bit of a problem with trying to get embedded data for a scoring category.
To be more specific, I am trying to use embedded data and a math operation to double the total of a scoring category in my survey. I have followed the instructions on how to use piped text to do so but when I export my data report no numerical values are listed for the math operation.
I have used every variant of the following code:
${ gr://SC_29RmIWJg6KFBGKO/Score * 2 }
So, I have added the $e and {} and removed them. But, I still cannot manage to get the embedded data to calculate a value.
Any help would be much appreciated!