Way to export Code Coverage of Individual ApexClass or Trigger in .csv format

ClassOrTriggerCodeCoverageScript

public class apexCodeCoverageWrapper {
	public Integer size {get;set;} 
	public Integer totalSize {get;set;} 
	public Boolean done {get;set;} 
	 
	public String entityTypeName {get;set;} 
	public List<Records> records {get;set;} 
	
}
public class Records {
	public String ApexTestClassId {get;set;} 
	public String ApexClassOrTriggerId {get;set;} 
	public Integer NumLinesCovered {get;set;} 
	public Integer NumLinesUncovered {get;set;} 
}

HttpRequest req = new HttpRequest();
req.setHeader('Authorization', 'Bearer ' + UserInfo.getSessionID());
req.setHeader('Content-Type', 'application/json');
String domainUrl=URL.getSalesforceBaseUrl().toExternalForm();
system.debug('********domainUrl:'+domainUrl);
req.setEndpoint(domainUrl+'/services/data/v43.0/tooling/query/?q=SELECT+ApexClassorTriggerId,+ApexTestClassId,+NumLinesCovered,NumLinesUncovered+FROM+ApexCodeCoverage');
req.settimeout(12000);
req.setMethod('GET');

Http h = new Http();
HttpResponse res = h.send(req);
string resBody = res.getBody();
system.debug(res.getBody()); 
apexCodeCoverageWrapper   JSONDetails=(apexCodeCoverageWrapper) System.JSON.deserialize(resBody, apexCodeCoverageWrapper.class);
system.debug('*********JSONDetails.records size='+JSONDetails.records.size());
system.debug('*********JSONDetails.records size='+JSONDetails.records[0]);

Map<Id,String> apexClassIdNameMap = new Map<Id,String>();
Map<Id,String> apexTriggerIdNameMap = new Map<Id,String>();
for(ApexClass ap:[select id,name from apexclass]){
	apexClassIdNameMap.put(ap.id,ap.name);
}
for(ApexTrigger at:[select id,Name from ApexTrigger]){
	apexTriggerIdNameMap.put(at.id,at.Name);
}
		
string header = 'Name , Id, ClassOrTrigger,ApexTestClassId,ApexTestClassName,NumLinesCovered, NumLinesUncovered,Code Coverage  \n';
string finalstr = header ;
for(Records rec: JSONDetails.records){
	string recordString='';
	decimal covPerc;
	decimal totalLines = rec.NumLinesCovered+rec.NumLinesUncovered;
	if(totalLines >0){
		covPerc = ((rec.NumLinesCovered)/(totalLines))*100;
	}else{
		covPerc = 0;
	}

	if(apexClassIdNameMap.get(rec.ApexClassOrTriggerId)!=null){
		recordString = apexClassIdNameMap.get(rec.ApexClassOrTriggerId)+','+rec.ApexClassOrTriggerId+',ApexClass,'+rec.ApexTestClassId+','+apexClassIdNameMap.get(rec.ApexTestClassId)+','+rec.NumLinesCovered+','+rec.NumLinesUncovered+','+covPerc+'\n';
	}else if(apexTriggerIdNameMap.get(rec.ApexClassOrTriggerId)!=null){
		recordString = apexTriggerIdNameMap.get(rec.ApexClassOrTriggerId)+','+rec.ApexClassOrTriggerId+',ApexTrigger,'+rec.ApexTestClassId+','+apexClassIdNameMap.get(rec.ApexTestClassId)+','+rec.NumLinesUncovered+','+covPerc+'\n';
	}
	finalstr = finalstr +recordString;
}
Messaging.EmailFileAttachment csvAttc = new Messaging.EmailFileAttachment();
blob csvBlob = Blob.valueOf(finalstr);
string csvname= 'ApexCodeCoverage report.csv';
csvAttc.setFileName(csvname);
csvAttc.setBody(csvBlob);
Messaging.SingleEmailMessage email =new Messaging.SingleEmailMessage();
String[] toAddresses = new list<string> {UserInfo.getUserEmail()};
String subject ='Apex Code Coverage Report';
email.setSubject(subject);
email.setToAddresses( toAddresses );
email.setPlainTextBody(subject);
email.setFileAttachments(new Messaging.EmailFileAttachment[]{csvAttc});
Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});