I guess I could express it as a nested dict in the first place?

ec2_specs:
  - { region: "us-east-1", ami: "ami-b66ed3de", count: 1, type: "t2.micro", 
containers: [{ name: "NGINX_A", hostport: "443" }, { name: "NGINX_B", 
hostport: "444" }] }
  - etc

I suspect though that if I need to express a large number of these, it can 
get error-prone - so a set of M properties and a set of N sub-properties 
would still be a more compact and less error-prone representation of this 
matrix.

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