The following code is added to the corresponding skin file of the widget. This will of course be overwritten in case of updates.
protected function render_post_header() { ?> <article <?php post_class( [ 'elementor-post elementor-grid-item' ] ); ?>> <div class="elementor-post__card"> <span class="koopimg"> <?php $values = get_field('partner'); if($values) { foreach($values as $value) { if( $value == 'bestimmtes') { echo "<img src='bild.png'>"; } } } ?> </span> <?php }