Just add the snippet and specify product ID's in the two spots below

• Code Snippets

// Add Terms Checkbox on specific product pages
add_action( 'woocommerce_before_add_to_cart_button', 'add_accept_terms_checkbox' );
function add_accept_terms_checkbox() {
    // Define the product IDs that need the checkbox
    $specific_product_ids = array( 123, 456 ); // Replace with your product IDs

    if ( is_product() && in_array( get_the_ID(), $specific_product_ids ) ) {
        echo '<div class="woocommerce-terms-checkbox">';
        echo '<label>';
        echo '<input type="checkbox" name="accept_terms" id="accept_terms" />';
        echo ' I have read and accept the <a href="/terms-conditions" target="_blank">terms and conditions</a>';
        echo '</label>';
        echo '</div>';
    }
}

// Validate Terms Checkbox before adding to cart
add_filter( 'woocommerce_add_to_cart_validation', 'validate_accept_terms_checkbox', 10, 2 );
function validate_accept_terms_checkbox( $passed, $product_id ) {
    $specific_product_ids = array( 123, 456 ); // Replace with your product IDs

    if ( in_array( $product_id, $specific_product_ids ) && ! isset( $_POST['accept_terms'] ) ) {
        wc_add_notice( 'You must accept the terms and conditions to proceed.', 'error' );
        return false;
    }

    return $passed;
}

SEO Titles

1. How to Add Terms Checkbox for WooCommerce Products
2. Require Terms Checkbox Before WooCommerce Add to Cart
3. Add Custom Checkbox to WooCommerce Product Pages
4. Require Accept Terms for WooCommerce Product Checkout
5. Adding Terms Checkbox for Specific WooCommerce Products