How would I add a new route to an existing route table in a VPC?
There’s been some work done by R. Estelle (@erydo) to split out route table functionality from the ec2_vpc module:
https://github.com/ansible/ansible-modules-core/pull/322
On top of these changes, I have a PR that adds exactly the functionality you’re looking for:
https://github.com/preo/ansible-modules-core/pull/2