artisan-1.x-dev/components/form-element-label/form-element-label.twig

{%
  set classes = [
    title_display == 'after' ? 'option',
    title_display == 'invisible' ? 'visually-hidden',
    required ? 'js-form-required',
    required ? 'form-required',
  ]
%}
{% if title is not empty or required -%}
  <label{{ attributes.addClass(classes) }}>{{ title }}</label>
{%- endif %}