@write2sethu This is a Featured Workspace in FireCloud: help-gatk/Somatic-SNVs-Indels-GATK4
If you open the workspace you should be able to see the Summary Tab which contains detailed information.
This workspace contains a few Method Configurations that you can use for your use case:
Mutect2 : This WDL workflow runs GATK4 Mutect 2 on a single tumor-normal pair or on a single tumor sample, and performs additional filtering and functional annotation tasks. [This is the configuration that I think you would find most useful]
Mutect2-normal-normal : Calls pair of replicates as tumor-normal pairs, counts the number of variants (i.e. false positives) and reports false positive rates.
Mutect2_pon : Create a Mutect2 panel of normals