// ---- Show add-ons in customer & admin emails ----
add_filter( 'woocommerce_order_item_name', function( $item_name, $item, $is_visible ) {
    $addons = wc_get_order_item_meta( $item->get_id(), '_extra_addons', true );
    if ( $addons ) {
        $addons = json_decode( $addons, true );
        if ( is_array( $addons ) && ! empty( $addons ) ) {
            $item_name .= '<ul style="margin:5px 0 0 15px;padding:0;">';
            foreach ( $addons as $addon ) {
                $item_name .= '<li>' . esc_html( $addon['name'] ) . ' (+ ' . wc_price( $addon['price'] ) . ')</li>';
            }
            $item_name .= '</ul>';
        }
    }
    return $item_name;
}, 10, 3 );
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