Include product SKU in Live Search result content

searchwp-customisations.php

<?php

add_filter( 'searchwp_live_search_results_entry_data', function( $data, $result ) {
    if ( $result instanceof \WP_Post && $result->post_type === 'product' ) {

        $sku = get_post_meta( $result->ID, '_sku', true );

        if ( ! empty( $sku ) ) {
            $data['content'] .= '<p><strong>SKU:</strong> ' . esc_html( $sku ) . '</p>';
        }
    }
    return $data;
}, 20, 2 );