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Pulumi is declarative: you declare the desired shape of a resource and Pulumi creates or updates it to match that shape. A flow which finds a resources, updates it and saves it is imperative, and is not supported by Pulumi.

In this case, you need to define the route tables in the normal manner, rather than using the defaults created by the AWSX convenience code.

You can create routes in a manner that looks to be "after the fact" by using `awsx.ec2.Subnet.createRoute()`. This adds to the declarative definition of the route tables that AWSX creates.