Escape Comma in Column While Creating CSV in LWC

I need to escape comma in Column values while Creating CSV file in LWC. I tried with replacing comma with Keywords but still when converting string into blob it splits value with comma. I'm sending JSON String from LWC which I need to convert in CSV.

.cls

 @AuraEnabled
    public static string saveTemplate(String jsonBody){
        try {
            string message = 'Subcontract Task Template Updated Successfully!';
            List<Object> dataList = (List<Object>)JSON.deserializeUntyped(jsonBody);
            List<String> csvRowValues = new List<String>();
            for(Object obj : dataList){
                Map<String,Object> mpStrObj = (Map<string,Object>)obj;
                String category = String.valueOf(mpStrObj.get('Category')) != null ? String.valueOf(mpStrObj.get('Category')) : '';
                String taskName = String.valueOf(mpStrObj.get('TaskName')) != null ? String.valueOf(mpStrObj.get('TaskName')) : '';
                String assignedTo = String.valueOf(mpStrObj.get('AssignedTo')) != null ? String.valueOf(mpStrObj.get('AssignedTo')) : '';
                String priority = String.valueOf(mpStrObj.get('Priority')) != null ? String.valueOf(mpStrObj.get('Priority')) : '';
                String status = String.valueOf(mpStrObj.get('Status')) != null ? String.valueOf(mpStrObj.get('Status')) : '';
                String dueDate = String.valueOf(mpStrObj.get('DueDate')) != null ? String.valueOf(mpStrObj.get('DueDate')) : '';
                String startDate = String.valueOf(mpStrObj.get('StartDate')) != null ? String.valueOf(mpStrObj.get('StartDate')) : '';
                String endDate = String.valueOf(mpStrObj.get('EndDate')) != null ? String.valueOf(mpStrObj.get('EndDate')) : '';
                String description = String.valueOf(mpStrObj.get('Description')) != null ? String.valueOf(mpStrObj.get('Description')) : '';
                String notes = String.valueOf(mpStrObj.get('Notes')) != null ? String.valueOf(mpStrObj.get('Notes')) : '';
                
                String rowStr = category + ',' + taskName + ',' + assignedTo + ',' + priority + ',' + status + ',' + dueDate + ',' + startDate + ',' + endDate + ',' + description.escapeCsv() + ',' +notes.escapeCsv();
                system.debug('Rowstr : '+rowStr);
                String temp = handleCommas(rowStr);
                csvRowValues.add(temp);
                
            }
            String csvColumnHeader = 'Category,Task Name,Assigned To,Priority,Status,Due Date,Start Date,End Date,Description,Notes\n';
            String csvFile = csvColumnHeader + String.join(csvRowValues,'\n');
            csvFile = csvFile.replaceAll(':quotes:', '').replaceAll(':comma:', ',');
            Blob body = blob.valueOf(csvFile);
            
            Document docId = [SELECT Id FROM Document WHERE Name = 'Subcontract Task Template'];
            
            document doc=new document();
            doc.Body= body;
            doc.Id = docId.Id;
            update doc;
            
            return message;
        } catch (Exception e) {
            throw new AuraHandledException(e.getMessage());
        }
    }
   
 public static String handleCommas(String csvLine){
        
        String prevLine = csvLine;
        Integer startIndex;
        Integer endIndex;
        
        while(csvLine.indexOf('"') > -1){
            
            if(startIndex == null){
                startIndex = csvLine.indexOf('"');
                csvLine = csvLine.substring(0, startIndex) + ':quotes:' + csvLine.substring(startIndex+1, csvLine.length());
            }else{
                if(endIndex == null){
                    endIndex = csvLine.indexOf('"');
                    csvLine = csvLine.substring(0, endIndex) + ':quotes:' + csvLine.substring(endIndex+1, csvLine.length());
                }
            }
            
            if(startIndex != null && endIndex != null){
                String sub = csvLine.substring(startIndex, endIndex);
                sub = sub.replaceAll(',', ':comma:');
                csvLine = csvLine.substring(0, startIndex) + sub + csvLine.substring(endIndex, csvLine.length());
                startIndex = null;
                endIndex = null;
            }
        }
                
        return csvLine;
    }