Shipping Rule does not apply to API? Am I able to get rates with parcel dimensions?

Easyship does support J&T services in Singapore and I have set Shipping Rule to retrieve J&T services as priority courier service, but after testing with Production and Sandbox token, both return NinjaVan as my courier.

Is it possible to get rates without parcel dimensions but with only total weight?
Because it is either with Total weight and Parcel dimension, or without them.

Would like your help please.

Thank You.