Hello,

You mean a text input to record dimensions of the item. I have listed it and will add in the future updates.

Thank you

Please use a field type(DECIMAL) that supports calculations. For example:
Total Volume: Calculate using the formula:
Total Volume = Length × Width × Height

Volumetric Weight: if you can Display the calculated volumetric weight next to the "Weight" column would be nice
Volumetric Weight = (Length × Width × Height) ÷ 5000

usually When determining the billing weight, compare the actual weight and the volumetric weight. The higher of the two values will be used for billing purposes.

Thanks for the support in adding new features.