How can I create a custom quantity field for individual and package prices?

Hello, I am currently creating a shop for a customer who would like a custom quantity field. He would like customers to be able to enter 1x individual quantities, e.g. 3.33m² or 1x package prices 1,2,3,4, which then corresponds to the package (e.g. 1.44m² x package quantity). The price should also be automatically adjusted to the quantity of the package, i.e. 1.44m² = 1 package, i.e. if 1.45m² is selected, the price for 2 packages should be displayed. Does anyone know a solution or an app for this? Here is an example of what the customer would like:

So there are two quantity field one which shows the quantity in m^2 and a package qunatity so the customar can decide if he needs a package or exact quantity for m^2. Also I would love to know how to update the price related to the quantity, so the quantity should increase if i change the quantity to 2 packages. I’m using the Dawn theme btw.

Hi! You can use free app: EXPO - Extra Product Options