Programmatically add label with URL

I am currently adding a label with URL called UAT Template based on the dropdown item select. The label should not be created if already exist.

• the link is not open in the new tab

• The label for some reason not created

    function AddURL(){
  
    let lblTemplate = document.getElementsByClassName("ard-FormField-description")[8];
    //Check if the lblTemplate contain word 'UAT Template location'
    if(lblTemplate.innerHTML !== '' && lblTemplate.innerHTML.toLowerCase().indexOf('UAT Template Location') > -1){
        if (lblTemplate.indexOf(lblTemplate) == -1) {
            // create anchor link element
            let link = document.createElement("a")
  
            // Create txt
            let txt = document.createTextNode("UAT Template Location")
  
            //append txt to anchor element
            link.appendChild(txt)
  
            // set the title
            link.title =" Click to UAT Template Location";
  
            // set the href property
            link.href = "https://gampoendev.com/:w:/r/teams/teamcollab/Shared%20Documents/Templates/";
            link.setAttribute('target','_blank');
  
            // get text to add link to
  
            lblTemplate.appendChild(link)
        }
        else {
            return;
        }
    }
  

  }