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Hi Richard!  I am unfortunately traveling on vacation until Monday. I can help then. I'm the meantime, I'm a lot of places we do allow you to pass extra values that we will just copy over wholesale. So it may be possible to do that here

But from your description it may not be, given that it's not in aws.  Sorry I can't be more helpful!  Happy to look again Monday if you can't get answers in the meantime

No worries, I think I can hack it by passing  `containerDefinitions` as a json file and using ecs.TaskDefinition

Went ahead and filed an issue for this one, <https://github.com/pulumi/pulumi-aws/issues/713>