Allow mapping nested attributes in normalized config

[simondanielsson]

What does this PR do?

This PR allows for renaming nested attributes in normalized config.

Fixes # (issue)

Before submitting

• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [ ] Did you make sure to update the documentation with your changes?
• [ ] Did you write any new necessary tests?

Who can review?

[github-actions[bot]]

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