EC2 dynamic inventory, filter using variable?

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Hi, I’m working my way through a migration to EC2 dynamic inventory.
I have everything working, but I’m a bit stuck on how to filter the found instances.

If I have this in aws_ec2.py, things work (i.e. I get the right instances):

plugin: amazon.aws.aws_ec2
regions:
  - "{{ lookup('ansible.builtin.env', 'AWS_DEFAULT_REGION') }}"
filters:
  tag:Environment: dev

I test this by:

ansible-inventory -i aws_ec2.py --list

But I’d like to use a variable for the environment. I thought that would be easy:

filters:
  tag:Environment: "{{ env }}"

and then doing:

ansible-inventory -e env=dev -i aws_ec2.py --list

But now I don’t get any instances…

Any ideas if this is possible at all…?