How To Add a New Record To Existing List Of Records in LWC JS Controller

Let's assume we are getting  list of records from the apex to js controller and for some reasons if we want to add new row how can we add to it we can see below.

import { LightningElement, api, track, wire } from "lwc";
import fetchActivities from "@salesforce/apex/CancelFlowCntrl.fetchCanActivities";

const columns = [
    { label: 'ticketvalue', fieldName: 'totalTicketvalue' },
    { label: 'refundedAmount', fieldName: 'totalRefundedAmount' },
    { label: 'cancellationCharges', fieldName: 'totCancellationCharges' },
    
];

export default class ActivitiesFlow extends LightningElement 
{
  
  @track allActivitiesData;
  
  @wire(fetchActivities, { recdId: '$sfrecordId' })
    wiredActivities({ error, data }) {
       if (data) 
       {
          this.allActivitiesData =  data;
		  var newItem = {"totalTicketvalue": 100,"totalRefundedAmount": 90,"totCancellationCharges":10};
		  this.allActivitiesData.push(newItem);

		}
		
		else if (error) {
            this.error = error;
            this.allActivitiesData = undefined;
           
        }
	}
 }

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