Injecting Dimensions for Split Shipping from custom plugin

Hi, I’m developing a plugin that automatically generates shipping dimensions upon option change, and when selecting large quantities, multiple small boxes are generated. I understand that in the premium version of your FedEx plugin, you support shipping multiple boxes. I would like to know if it is possible to use my array of dimension objects to calculate the shipping cost, either by a plugin filter or by any other way.
Example: My product requires 3 shipping boxes, and therefore my plugin generates an array containing 3 objects, each containing a box’s dimensions:
[
{ width: 12
height: 18
length: 10
weight: 75
},
{ width: 12
height: 18
length: 10
weight: 75
},
{ width: 12
height: 18
length: 10
weight: 50
}
]
I would like to be able to use these values to calculate the shipping cost.

Thanks in advance.