Basically I have a custom option price which gets applied to each quantity. But I only want to apply that custom option price once instead of applying to each quantity. Below I am adding image of custom option 
No matter how much is the quantity I only want to apply custom option price once to total price
for example
if I am adding product item with below properties to cart
->Price per piece/item = 20.25
->qty = 2
->cusom_option_price = 4
->subtotal = 40.50(20.25 * 2) + 4
->subtotal = 44.50 expected in checkout cart product item subtotal
but what I get now is 48.50(actual) in /checkout/cart/ as custom option price is getting applied based on each quantity. I am trying to manipulate vendormagentomodule-catalogModelProductTypePrice.php it has functions getFinalPrice and _applyOptionsPrice lets see if that works. Can anyone please guide me through this? it would be really helpful in continuing my learning about magento 2 concepts
