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JavaScript Making A Chrome Extension, unsure how to store multiple items in chrome.local.storage?

BubbleMan

New Coder
I am makinng a note-taking chrome extension but the code only remembers the last note that was added to it, not all of the notes. Code Below:

index.js:
JavaScript:
key = "note"

chrome.storage.local.get([key], function(result) {
    let elem = document.createElement('label')
    let space = document.createElement('br')
    elem.innerHTML=result.note;
    document.getElementsByTagName('body')[0].appendChild(space);
    document.getElementsByTagName('body')[0].appendChild(elem);
  });

popup.html:
HTML:
<html>
  <head>
    <link rel="stylesheet" href="page.css">
  </head>
  <body>
    <div class="container">
      <button id="addNotes">+</button>
      <input type="text" id="input">
      <label id="label"></label>
    </div>
    <script src=popup.js></script>
    <script src=index.js></script>
  </body>
</html>

popup.js:
JavaScript:
let AddNote = document.getElementById("addNotes");
let input = document.getElementById("input")
var key = 'note';



AddNote.addEventListener("click", function () {
      let elem = document.createElement('label');
      let space = document.createElement('br');
      elem.innerHTML = input.value;
      document.getElementsByTagName('body')[0].appendChild(space);
      document.getElementsByTagName('body')[0].appendChild(elem);

      chrome.storage.local.set({[key]: input.value});

});
 
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