Set Minimum characters for Text Area

const textarea = document.getElementById('TextArea_ID'); // Replace the id 

textarea.addEventListener('input', function() {
  const minTextLength = 10; // Set Minimum required text length  

  if (textarea.value.length < minTextLength) {
    textarea.setCustomValidity('Please enter at least ' + minTextLength + ' characters.');
  } else {
    textarea.setCustomValidity('');
  }
});

In case need a tutorial to add the code: https://youtu.be/RRhmWHDpZ0I