For using your specific Survey, you will need to create a custom Formula override with Key as Feedback result and deactivate the OOB formula override related to Feedback result.
In your custom Formula override, you can copy rest of the code similar to the OOB one. The only change that you would need to make is to modify the line shown below and replace the existing metric name with your specific metric name whose metric results you want to display on VA dashboard widget 'User Feedback' (as shown below).
