convert a!query to value to be saved

seems I almost there, the problem I found is that the value i supposed to be saved for a!query is not the standard form. What should be the correct one?

a!save(target:ri!userrole.USER_ID,
          value:cast(type!Integer,
            a!queryEntity(
              entity:cons!KONE_Development_userrole_Constant,
              fetchTotalCount:true,
              query:a!query(
                selection: a!querySelection(
                  columns: {
                    a!queryColumn(
                      field: "USER_ID"
                    )
                  }
                ),
                filter:a!queryFilter(
                  field:"NAME",operator:"=",
                  value:ri!userinputsheet.kone_user_name,
                  applyWhen:not(isnull(ri!userinputsheet.KONE_user_name))
                ),
                pagingInfo:a!pagingInfo(
                  startIndex: 1,
                  batchSize: 50
                )
              )
            ).data.USER_ID)
          ),