Showing Help Text

Is it possible to show help texts like described in https://getbootstrap.com/docs/4.0/components/forms/#help-text?

The HTML code would look like this:

<div class="form-group">
    <label for="inputPassword6">Password</label>
    <input type="password" id="inputPassword6" class="form-control mx-sm-3" aria-describedby="passwordHelpInline">
    <small id="passwordHelpInline" class="text-muted">
      Must be 8-20 characters long.
    </small>
  </div>