How to change price on checkout page in woocommerce via ajax?

Question

WordPress

If this code is written in function.php, then when the page is loaded, the entire "total" price will change to the specified one.
How can I change the price on ajax request? And then when you switch to payment, the same price remained.

add_filter('woocommerce_get_price', 'cmw_custom_price', 100, 2);
function cmw_custom_price($price, $info){
$price = $price*50;
return $price;
}

woocommerce guru helppp+++