php - How to add a customizable text after WooCommerce add to cart button

Based on this, you can show a different message per product, or a default message

So you get:

// Add to general_product_data tab
function action_woocommerce_product_options_general_product_data() {
    // Text field
    woocommerce_wp_text_input( array(
        'id'                 => '_my_custom_text',
        'label'              => __( 'My custom text', 'woocommerce' ),
        'placeholder'        => '',
        'description'        => __( 'Add your custom text', 'woocommerce' ),
        'desc_tip'           => true,
    ));
}
add_action( 'woocommerce_product_options_general_product_data', 'action_woocommerce_product_options_general_product_data', 10, 0 );

// Save custom field
function action_woocommerce_admin_process_product_object( $product ) {
    // Isset
    if ( isset( $_POST['_my_custom_text'] ) ) {        
        // Update
        $product->update_meta_data( '_my_custom_text', sanitize_text_field( $_POST['_my_custom_text'] ) );
    }
}
add_action( 'woocommerce_admin_process_product_object', 'action_woocommerce_admin_process_product_object', 10, 1 );

// Display after add to cart button
function action_woocommerce_after_add_to_cart_button() {
    global $product;
    
    // Is a WC product
    if ( is_a( $product, 'WC_Product' ) ) {
        // Get meta
        $message = $product->get_meta( '_my_custom_text' );
        
        // When Empty, use default message
        if ( empty ( $message ) ) {
            $message = __( 'Default text', 'woocommerce' );
        }
        
        echo '<div class="second_content">' . $message . '</div>';
    }
}
add_action( 'woocommerce_after_add_to_cart_button', 'action_woocommerce_after_add_to_cart_button' );
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