can’t insert block in editorjs – Blancer.com Tutorials and projects

I am using Editor.js. I’ve tried adding a new block to the editor but it doesn’t work

<html>
    <script src="https://cdn.jsdelivr.net/npm/@editorjs/[email protected]/dist/editorjs.umd.js" type="text/javascript"></script>
</head>
<body>
    <div id="editorjs" class="editor-holder"></div>

    <script>
        var editor = new EditorJS({
      holder: 'editorjs',
      autofocus: true,
      data: {
        "time": 1550476186479,
        "blocks": [{
            type: 'paragraph',
            data: {
             text: 'Hello world'
            }}
        ]}
    })

    const newBlock = {
      type: 'paragraph',
      data: {
          text: 'Hello world'
      }
    };

    editor.blocks.insert(newBlock.type, newBlock.data);

    </script>

</body>

I’m facing the following error:

Uncaught TypeError: Cannot read properties of undefined (reading 'insert')

I’ve also tried following:

editor.blocks.insert(newBlock);

editor.configuration.data.blocks.push(newBlock);

editor.api.blocks.insert(newBlock);

but I get errors