ParameterStore lets you store String, StringList or SecureString. But there's no limit to SecureString.
A SecureString can be `postgres://admin:hunter2@localhost:5432/db`. It can also be `{"username": "admin", "password": "hunter2", "host": "localhost", "port": "5432"}`.
Sure you could do that if you don't mind adding in your own string->dict conversion. I wouldn't be surprised if the internal implementation is near-identical. Secrets Manager seems like a slightly more easy-to-use version of Parameter Store that's also visible, instead of hidden away inside Systems Manager.
