is it possible ?

Try this.

var scrollBox = document.getElementsByClassName("scrollarea-area");

var jqLoader = document.createElement("script");
jqLoader.src = "https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js";

    jqLoader.onload = function() {
    jqLoader.onload = null;
    init();
}

document.head.appendChild(jqLoader);

function init(){
    $(window).resize(function(){
    var newHeight = scrollBox[0].scrollHeight - scrollBox[0].offsetHeight;
    var player = GetPlayer();
    var height = newHeight;
    });

    scrollBox[0].onscroll = function(){
    var height = scrollBox[0].scrollHeight - scrollBox[0].offsetHeight;
    var player = GetPlayer();
    player.SetVar("someNum",scrollBox[0].scrollTop/height*100);
    };
}

Then you can set a trigger for what you want to do based on the change of "someNum" variable.