Is the youtube video being watched available on any of your lists?

youtubeCheckbox.js

var l = document.getElementsByClassName('style-scope ytd-playlist-add-to-option-renderer').length
for (let i = 0; i < l; i++) {
        var liste = document.getElementsByClassName('style-scope ytd-playlist-add-to-option-renderer')[i].getAttribute("aria-checked");
        if(liste == 'true'){alert("This video is in your playlist.");}
}   


/* 
var checkbox = document.querySelector("#checkbox")
var listName = document.querySelector("#checkboxLabel")
*/