Added the `getItemValueCallback` for the https://surveyjs.answerdesk.io/ticket/details/T2080
Added the `getItemValueCallback` for the https://surveyjs.answerdesk.io/ticket/details/T2080

surveyjs/surveyjs,surveyjs/surveyjs,andrewtelnov/surveyjs,andrewtelnov/surveyjs,surveyjs/surveyjs,andrewtelnov/surveyjs,surveyjs/surveyjs