Getting vars using AWS dynamic inventory plugin

[Rob White]

I want to set some static vars alongside my AWS inventory plugin config but I can't find any doc.  Maybe this isn't supported or maybe my syntax is incorrect.

plugin: aws_ec2

iam_role_arn: arn:aws:iam::1234567890:role/assumed-ansible

regions:

  - ap-southeast-1

hostnames:

  - ip-address

strict_permissions: False

strict: False

keyed_groups:

  - prefix: tag

    key: tags

all:

  vars:

    aws_account_name: myaccount

With a simple playbook to just output aws_account_name it always fails with...

'aws_account_name' is undefined

I've also tried the AWS group name like

aws_ec2:
  vars:
    aws_account_name: myaccount

but that doesn't work either