What is the HCL equivalent for `${aws:username}`?

Vault
1

This documentation describes the vault role required to use AWS IAM as an auth method:

I’m unsure how to convert this line into HCL though:

"Resource": "arn:aws:iam::*:user/${aws:username}"

What is the HCL equivalent for ${aws:username}?

2

The answer is to escape the $ with $$