Add class to all Elementor H1 titles

We’re adding page and post H1 titles with Elementor, getting output like this:

<h1 class="elementor-heading-title elementor-size-default">TITLE</h1>

I need to add “entry-title” as a class to all H1 elements added via Elementor and would like to find a global solution. I can’t find anything in the Elementor settings. I also tried this, but doesn’t work either:

function h1_entry_title( $classes ) {
  $classes[] = 'entry-title';
  return $classes;
}
add_filter('the_title', 'h1_entry_title');

If anyone has any tips, it would be much appreciated.