modification of plugin

-- HikaShop version -- : 4.4.5
-- Joomla version -- : 4.0.6
-- PHP version -- : 8.0

I need a modification of this plugin : https://github.com/pjdevries/plg_system_hikashopsurfaceprice

Now it is using the product price for both the picklist as well as the custom size. This should change for the custom sizes that are not coming from the picklist

These products come of a roll. This comes in 3 different widths with different prices

Just to clarify, there will be products with 3 price ranges as per different sizes.
For example:
10-100 cm width price will be €3 / Square meter
100-150 cm width price will be €5 / Square meter
and another price for another range

The price should eventually be presented on the page after choosing the sizes.