How can I create a custom RAG (Red-Amber-Green) status column in my Aperture workflow?

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Hello!
I’ve been using the built-in validation rules in Aperture (like validate telephone, email, and address), and I really like how they generate a RAG-style column to show data quality at a glance.
I’m now looking to create my own custom RAG status based on specific business rules for example, combining multiple fields or thresholds and I’d like the output to be colour coded (Red, Amber, Green) just like the validation rules.

Any guidance on this would be useful

Thanks

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