JSFiddle - React, Tailwind, and code Playground

HTML

<form action="/" id="form">
  <div class="input-block">
        <label class="output-field">Вопрос:</label>
        <textarea></textarea>
    </div>
    <div class="input-block">
        <label class="output-field">Ответ 1:</label>
        <textarea></textarea>
        <img src="https://ru.seaicons.com/wp-content/uploads/2016/09/Actions-dialog-close-icon.png" width="21" height="21" />
    </div>
    <!-- вставлять сюда -->
</form>
<div class="container">
    <button class="insert_button">Добавить ответ</button>
</div>

JavaScript

forms();
function forms(){
	let insertButton = document.querySelector(".insert_button");
	let form = document.getElementById("form");
	let num = 2;

	insertButton.addEventListener("click",e => {
		num++;
		form.appendChild(createElem(num));
	});

	function createElem(){
		let label = document.createElement("label");
		let br = document.createElement("br");

		let input = document.createElement("textarea");
			input.setAttribute("type", "text");
			input.classList.add("input");

		let	img = document.createElement("img");
			img.height = 21,img.width = 21,img.src = "https://ru.seaicons.com/wp-content/uploads/2016/09/Actions-dialog-close-icon.png",img.classList.add("delete");
			img.addEventListener("click", e => {
				e.target.parentNode.remove();
				calculate();
			});
		
		let span = document.createElement("span");
			span.appendChild(document.createTextNode("Ответ " + num));

		label.appendChild(span);
		label.appendChild(input);
		label.appendChild(img);
		label.appendChild(br);
		
		return label;
	}

	function calculate(){
		let SPANS = document.getElementsByTagName('form')[0].getElementsByTagName('span');
		for(i=0; i<SPANS.length; i++){
			SPANS[i].innerText = "Ответ " + +(i + 1);
		}
		num = SPANS.length;
	}
}