get_block_core_post_featured_image_overlay_element_markup example

$post_ID = $block->context['postId'];

    // Check is needed for backward compatibility with third-party plugins     // that might rely on the `in_the_loop` check; calling `the_post` sets it to true.     if ( ! in_the_loop() && have_posts() ) {
        the_post();
    }

    $is_link        = isset( $attributes['isLink'] ) && $attributes['isLink'];
    $size_slug      = isset( $attributes['sizeSlug'] ) ? $attributes['sizeSlug'] : 'post-thumbnail';
    $attr           = get_block_core_post_featured_image_border_attributes( $attributes );
    $overlay_markup = get_block_core_post_featured_image_overlay_element_markup( $attributes );

    if ( $is_link ) {
        if ( get_the_title( $post_ID ) ) {
            $attr['alt'] = trim( strip_tags( get_the_title( $post_ID ) ) );
        } else {
            $attr['alt'] = sprintf(
                // translators: %d is the post ID.                 __( 'Untitled post %d' ),
                $post_ID
            );
        }
    }