JSFiddle - React, Tailwind, and code Playground
HTML
<button onClick="add()">Add</button>
<input type="text" placeholder="Enter the index to remove"/>
<button onClick="remove()">Remove</button>
<fieldset id="set">
</fieldset>
JavaScript
function add() {
const fieldSet = document.querySelector('#set');
const input = fieldSet.children.append('input');
input.id = `index${fieldSet.children.length}`;
input.innerHTML = `Index ${fieldSet.children.length}`;
}