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Not currently, but it would be very easy to expose a new input argument to pass additional user data to include. See <https://github.com/pulumi/eks/blob/master/nodejs/eks/cluster.ts#L328>. 

Fee free to open an issue or PR in that repo. 

<https://github.com/pulumi/eks/issues/14>

I'm using this via Python, though, so not sure it was the proper location