JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://cdn.quilljs.com/1.3.4/quill.snow.css">
<script src="https://cdn.quilljs.com/1.3.4/quill.js"></script>
<div id="editor">
  <p>Hello World!</p>
  <p>Some initial <strong>bold</strong> text</p>
  <p><br></p>
</div>

JavaScript

var quill = new Quill('#editor', {
    theme: 'snow',
    modules: {
    	toolbar: {
        container:
        [
            [{ 'placeholder': ['[GuestName]', '[HotelName]'] }], // my custom dropdown
            ['bold', 'italic', 'underline', 'strike'],        // toggled buttons
            ['blockquote', 'code-block'],

            [{ 'header': 1 }, { 'header': 2 }],               // custom button values
            [{ 'list': 'ordered' }, { 'list': 'bullet' }],
            [{ 'script': 'sub' }, { 'script': 'super' }],      // superscript/subscript
            [{ 'indent': '-1' }, { 'indent': '+1' }],          // outdent/indent
            [{ 'direction': 'rtl' }],                         // text direction

            [{ 'size': ['small', false, 'large', 'huge'] }],  // custom dropdown
            [{ 'header': [1, 2, 3, 4, 5, 6, false] }],

            [{ 'color': [] }, { 'background': [] }],          // dropdown with defaults from theme
            [{ 'font': [] }],
            [{ 'align': [] }],

            ['clean']                                    // remove formatting button
           
        ],
        handlers: {
            "placeholder": function (value) { 
                if (value) {
                    const cursorPosition = this.quill.getSelection().index;
                    this.quill.insertText(cursorPosition, value);
                    this.quill.setSelection(cursorPosition + value.length);
                }
            }
        }
      }
    }
  });
  
  
  // We need to manually supply the HTML content of our custom dropdown list
         const placeholderPickerItems = Array.prototype.slice.call(document.querySelectorAll('.ql-placeholder .ql-picker-item'));

        placeholderPickerItems.forEach(item => item.textContent = item.dataset.value);

        document.querySelector('.ql-placeholder .ql-picker-label').innerHTML
            = 'Insert placeholder' + document.querySelector('.ql-placeholder .ql-picker-label').innerHTML;