Hello @Rahul74 ,
You can create your package to perform this , where you can write logic to show the different shipping fee based on customer selected countries .
please check our developer doc to create your own shipping package:
https://devdocs.bagisto.com/create_shipping_method.html
if want to know how to create package then go through with this first:
https://devdocs.bagisto.com/create_package.html
Thanks!