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I can think of two ways to achieve this.
First Set the lambda up as an cloudwatch rule which is triggered by this specific stack update - I believe this would have to be a "AWS API Call via CloudTrail" event. Your nested stack would create the cloudwatch rule and potentially run the lambda on the initial creation. But I don't think this will work in your case as you need the output within the stack on the update
Second - one I have used multiple times Create a parameter to the parent stack, pass to nested stack and add as a environment var within your lambda. When I have used this method I usually triggered via a pipeline so I make the parameter the pipeline-execution-id so it changes on every execution.
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