@Override
    public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder,
            WriteCellData<?> cellData, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
        // Only process cell data of string type
        if (cellData != null && cellData.getType() == CellDataTypeEnum.STRING) {
            String originalString = cellData.getStringValue();
            if (originalString != null && HEX_PATTERN.matcher(originalString).find()) {
                String escapedString = escapeHex(originalString);
                cellData.setStringValue(escapedString);
            }
        }
    }
A cell write handler that escapes _x[0-9A-Fa-f]{4}_ format strings to prevent POI from automatically decoding them.
<p>
In Office Open XML, _xHHHH_ format is used to encode special characters. For example, _x000D_ represents the Unicode
character 0D (carriage return).
<p>
To store the literal _xHHHH_ sequence without it being decoded by POI, we need to escape the initial underscore by
replacing _x with _x005F_x.
fastexcel-core/src/main/java/cn/idev/excel/write/handler/EscapeHexCellWriteHandler.java