Hi Simran, if you want to directly write data into an excel sheet using Selenium, that won't be possible. But you can use Apache POI to write data into a sheet. For reference, you can check this code snippet which is writing data into an excel sheet by adding new rows:
package excelExportAndFileIO;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class WriteExcelFileDemo {
    public void writeExcel(String filePath,String fileName,String sheetName,String[] dataToWrite) throws IOException{
        //Create an object of File class to open xlsx file
        File file =    new File(filePath+"\\"+fileName);
        //Create an object of FileInputStream class to read excel file
        FileInputStream inputStream = new FileInputStream(file);
        Workbook inputWorkbook= null;
        //Find the file extension by splitting  file name in substring and getting only extension name
        String fileExtensionName = fileName.substring(fileName.indexOf("."));
        //Check condition if the file is xlsx file
        if(fileExtensionName.equals(".xlsx")){
        //If it is xlsx file then create object of XSSFWorkbook class
        inputWorkbook = new XSSFWorkbook(inputStream);
        }
        //Check condition if the file is xls file
        else if(fileExtensionName.equals(".xls")){
            //If it is xls file then create object of XSSFWorkbook class
            inpputWorkbook = new HSSFWorkbook(inputStream);
        }    
    //Read excel sheet by sheet name    
    Sheet sheet = inputWorkbook.getSheet(sheetName);
    //Get the current count of rows in excel file
    int rowCount = sheet.getLastRowNum()-sheet.getFirstRowNum();
    //Get the first row from the sheet
    Row row = sheet.getRow(0);
    //Create a new row and append it at last of sheet
    Row newRow = sheet.createRow(rowCount+1);
    //Create a loop over the cell of newly created Row
    for(int j = 0; j < row.getLastCellNum(); j++){
        //Fill data in row
        Cell cell = newRow.createCell(j);
        cell.setCellValue(dataToWrite[j]);
    }
    //Close input stream
    inputStream.close();
    //Create an object of FileOutputStream class to create write data in excel file
    FileOutputStream outputStream = new FileOutputStream(file);
    //write data in the excel file
    inputWorkbook.write(outputStream);
    //close output stream
    outputStream.close();
	
    }
    public static void main(String...strings) throws IOException{
        //Create an array with the data in the same order in which you expect to be filled in excel file
        String[] valueToWrite = {"Miss. Abha","Bangalore"};
        //Create an object of current class
        WriteExcelFileDemo objExcelFile = new WriteExcelFileDemo();
        //Write the file using file name, sheet name and the data to be filled
        objExcelFile.writeExcel(System.getProperty("user.dir")+"\\src\\excelExportAndFileIO","ExportExcel.xlsx","ExcelDemo",valueToWrite);
    }
}