How to track multiple products purchased in a single visit

Hi, colleagues.

I nee to track different values inside the single variable. For example, on one of our pages user can select up to 6 devices to purchase. And for each of the device user can select number of devices. For example user can purchase two items of Device_1, three items of Device_2 and four items of Device_3. And I need to store it in variables in single hit.

So, I don't want to put all values of devices in the string with some delimiter and use this concatenated string as a single value of the eVar.

I would like to have separate value for each purchased device. Also, i need to store number of devices purchased into the second variable and be able to detect how many devices of each type were bought.

I think guys from e-commerce market do this every day )) Could somebody describe me best practices?

P.s. We use Launch with datalayer architecture.

Thanks in advance!