I want Chrome to detect right-click events

For your information only
I'm not familiar with Chrome app, so I don't know about it, but
If it's normal js, would it be like the following?

// Let's say the id is something.
variable= document.getElementById("something");
element.onclick=function(e){
    if(e.button===2){
        // Write down the right-click process in here.
    }
}

Reference
click-Event reference|MDN

Another solution I found while researching myself was that I was able to implement it by processing the contextmenu event.

varem= document.querySelector('#targetElement');
elem.addEventListener('contextmenu', function(e){

  // block browser default right-click behavior
  e.preventDefault();

  // Displaying the DOM element representing the UI of the context menu in the mouse position
  varcontextMenu= document.querySelector('#myContextMenu');
  contextMenu.classList.remove('hidden');
  contextMenu.style.left=e.x+'px';
  contextMenu.style.top=e.y+'px';

});