Generate JSON for utility Bills

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Dear All, I am following a NREL monthly calibration model that I sourced from Github. It requires a JSON file of utility bill values to import into Parametric Analysis tool and I am trying to replicate the process using measures that I need.

To do that, I am trying to generate a JSON file of utility bill values.The values were input in the OpenStudio model manually. I tried creating an output variable using the name of the utility bill for electric and gas, but a JSON file has not been exported. Am I missing something? is there a measure to specifically output a JSON file containing utility bill values or is there some other process to accomplish that?

Thanks