Why Apexaction flow setoutput variable not showing from apex class

Question

I Want to set output values in flow from apex action.

Below mentioned im getting oppId as input values from apex class.

public class flowinputs{
            @invocableVariable public String oppId;
           }

But Store Output Values not showing my apex results class Quoteids, QuoteSums.

This sample pic from google Same(result in setoutputvalues) like this i want to see in my Action, in order to store the output value (in my case the Results are Quoteids,QuoteSums):

Please refer the below screenshot like this i want.

See below image output values not showing from apex class result Quoteids, QuoteSums. In set ouput values i can't able to declare new resources also.

In Flow Debug im getting my results but im not able to assign output values

Here is apex code, Im getting results, I need to get setoutputvalues from apex as collection variable.

    public class checksum {
    public class flowinputs{
            @invocableVariable public String oppId;
           
    }
    public class results{
            @invocableVariable public Decimal Quotesum;
        public results(Decimal Quotesums){this.Quotesum=Quotesums;}
          @invocableVariable public string Quoteid;
        public results(string Quoteids){this.Quoteid=Quoteid;}
        
    }
@invocableMethod
    public static list<list<results>> countSum(list<flowinputs> requests){
        list<list<results>> usd =new list<list<results>>();
        list<results> ussd=new list<results>();
        usd.add(ussd);
        List<id> oppids = new list<Id>();       
        for(flowinputs request:requests)
        {
            oppids.add(request.oppId);
            
        }
        for(AggregateResult Qsum: [select SBQQ__Quote__r.id quoteid,SBQQ__Product__r.id prid,sum(SBQQ__Quantity__c) qunty from SBQQ__QuoteLine__c where SBQQ__Quote__r.id=: oppids group by SBQQ__Product__r.id,SBQQ__Quote__r.id]){
           String accid =(String)Qsum.get('quoteid');
            String acid =(String)Qsum.get('prid');
            Decimal quotesums=(Decimal)Qsum.get('qunty');
           // System.debug('accid' +accid);
            System.debug('sum'+quotesums);
            ussd.add(new results(quotesums));
              ussd.add(new results(acid));
            ussd.add(new results(accid));
        }
            
return usd;
    }
    
}