Is it possible to manipulate Yandex map elements?

Question

JavaScript

There is a page with Yakarta. The page code is available, but there is no possibility to edit the map.
Is it possible to implement the following without having access to the map code: when you click on a certain balloon (there are already balloons on the map), a certain link opens.
This code simply appends a new URL to the current URL in the address bar:

var BTN = document.getElementById('id_161598474410587029032');

function MyFunction() {
  location.href = 'yandex.ru'; 
}

BTN.onclick = MyFunction();