default WriteCellData<?> convertToExcelData(T value, ExcelContentProperty contentProperty,
                                                GlobalConfiguration globalConfiguration) throws Exception {
        throw new UnsupportedOperationException("The current operation is not supported by the current converter.");
    }
Convert Java objects to excel objects

@param value               Java Data.NotNull.
@param contentProperty     Content property.Nullable.
@param globalConfiguration Global configuration.NotNull.
@return Data to put into a Excel
@throws Exception Exception.
fastexcel-core/src/main/java/cn/idev/excel/converters/Converter.java