In case of a need in dynamically change the jSON input for the API per job, the pre-job should place into the workspace directory a file with the relevant jSON string to be sent to the vAPI.
The input file should be place into the working directory. In case this field is empty, The file name need to be: ${BUILD_NUMBER}.${BUILD_ID}.vapi.input
Please fill this field only in case, you want to hard code the input file name, to be consist across all builds.