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You can import a lambda function into the pulumi state and then use pulumi to further modify it: https://www.pulumi.com/registry/packages/aws/api-docs/lambda/function/#import

Do I need it in order to create a new subscription filter?

Do you mean a log subscription filter? Because no you could create one of those and just give it the ARN of the lambda function as string, no need to import the function to be managed.

great, thanks!