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I'm not familiar with Transit GW but if you cannot find required resources here: <https://www.pulumi.com/docs/reference/pkg/aws/ec2transitgateway/>

then look at API ref <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_Operations.html>

if there are methods that would help you achieve what you need, the next best thing you can do about it is to create a dynamic provider in pulumi