Hi all, I'm working on get the current record with some fields (Name, Current_Balance__c) by <force:recordData /> in aura component. How do we get the value from Controller and update the record field?

Thanks!

Component

<aura:component controller="DueBalanceController" implements="force:lightningQuickAction,force:appHostable,flexipage:availableForRecordHome,force:hasRecordId" access="global" >
   <aura:attribute name="accountRecord" type="Object"/>
   <aura:attribute name="sumBalance" type="Object"/>
   <aura:attribute name="today" type="Date" />
   <aura:handler name="init" value="{!this}" action="{!c.init}"/>
    
    <force:recordData aura:id="recordLoader"
                      recordId="{!v.recordId}"
                      fields="Name,Current_Balance__c"
                      targetFields="{!v.accountRecord}"
                      /> 
    <div>
        <lightning:card aura:id="warning-box" title="Billing So-far" >
			<lightning:layout>
               <lightning:layoutItem class="slds-p-around_x-small" size="12">
                       <lightning:formattedNumber value="{!v.accountRecord.Current_Balance__c}"/></div>
               </lightning:layoutItem>
            </lightning:layout>
        </lightning:card>
    </div>
</aura:component>

Contorller.js

({
    init: function(component, event, helper) {
        var today = $A.localizationService.formatDate(new Date(), "YYYY-MM-DD");
        component.set('v.today', today);
        var accountRecord = component.get("v.accountRecord");
        var recordId = component.get ("v.recordId");      
        var action = component.get("c.sumBalance");
        action.setParams({recordId:recordId});
        action.setCallback(this, function(response){
            let state = response.getState();
            if (state === "SUCCESS") {
            component.set("v.sumBalance",response.getReturnValue());
            component.set("v.accountRecord.Current_Balance__c",sumBalance.bl);
            component.find("recordLoader").reloadRecord();
            } else {
                console.log("Failed with state: " + state);
            }
        });
        $A.enqueueAction(action);
    },
})

Apex Contorller

public with sharing class DueBalanceController{
    @AuraEnabled
    public static Object sumBalance (String recordId){
        Date d_today = system.Date.today();
        AggregateResult[] groupedResults = [
            SELECT SUM(Balance__c)bl,SUM(Paid_Total__c)pt,SUM(Billing_Total__c)bt, Tenant__c
            FROM Billing__c 
            WHERE Tenant__c	= :recordId AND (User_Due_Date__c <= :d_today OR Paid_Date__c <=:d_today) AND (Status__c='Unpaid' OR Status__c='Paid' OR Status__c='Captured' OR Status__c ='Chasing Overdue')
            GROUP BY Tenant__c
        ];
        return groupedResults[0];
       
    }
}