I think I may have brought this up multiple times in different ways :D
When dealing with long and complicated configurations (whether config objects, yaml, or otherwise), it's often useful to break them down into relevant chunks (think hydra, maybe).

In our case, we have a custom YAML instruction !include , i.e.
` # foo.yaml
bar: baz

bar.yaml

obj: !include foo.yaml
maybe_another_obj: !include foo.yaml `