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Is this for use in a lambda or similar? You can't use Pulumi code from lambdas (or at least, you couldn't last time I tried...). Instead, put the value into something accessible at run time, like SSM Parameters, a vault, or similar. Then the serialized code should use normal AWS SDK to retrieve that value.

Alternatively you could pass the value into the serialized function, but that comes with a loss of encryption, I think.