magento2 – How to add condition to the rate table ?, in the shipping methods

I’m using magento 2.3.4, I’ve added a “Price vs. Destination” condition, and I’ve uploaded my table of conditions in csv. but I would like to know if there is any way to apply the shipping amount with percentage X% of the subtotal of the order, and apply a certain percentage to different zip codes,
I have thought of modifying the file and adding more fields and making the internal conditions in the shipping module.
anyone have any idea how to implement these conditions?