You can add new elements to objects by writing them to the desired keys. Let's see how it's done. Let's have the following object:
let obj = {};
Let's add new elements to it:
obj['a'] = 1;
obj['b'] = 2;
obj['c'] = 3;
You can use alternative syntax:
obj.a = 1;
obj.b = 2;
obj.c = 3;
Check the content of the object:
console.log(obj);
Create an empty object and then fill it with values.