products Same Shipping Cost on multiple items

[SneakyMouse]

Hey there!
I have a question.
I have about 9 thousand products imported from a CSV file. In the CSV file, there is an NVS column. If the item has N, then only 1 shipping cost is charged, even if 5 units are ordered.
If the item has V or S, there is one shipping charge for each unit, which adds the shipping cost to the order.

Shipping cost is importing without a problem, but the problem is that NVS.
If the product has an N value, only one (1) shipping cost will be charged, even if 5 units are ordered.
If the product has a value of V or S, then a shipping cost is charged for each unit of the product, which adds the shipping cost to the order.
But the value of these N, V and S classes can be different. That is, for one product with S class it may be 8 euros and for another it may be 10 euros and for a third it may be 13 euros.
It is necessary to be able to specify this NVS column when importing products. When importing, the N, V or S parameter would go into the product and the "Additional shipping price" would be related to it.
That is, if N and 5 euros is specified, then at least for 20 units there will be 5 euros extra.
And if V or S is specified, then for each unit of the product will be added 5 euros.

Question. How can this be done? Any way will do, even if it is an out-of-the-box module.

Edited August 2, 2023 by SneakyMouse
Added info (see edit history)