JSFiddle - React, Tailwind, and code Playground

JavaScript

var prop = new Array();
var Myobj = {
    property1 : 'aaa',
    property2 : 'bbb',
    property3 : {a: prop}
                /*  ^-- is this somehow possible without using a function? */
};
prop.push(Myobj.property1);

window.alert(Myobj.property3.a);