AWS Lambda Plugin - Invocation with IAM role

Is there any way to invoke lambda function with assume role?
Would like to use IAM role instead of access_key and secret_key.

This guide is a little dated but step 5.2 goes over using IAM role: Let me know if this works for you.

Thanks for your reply.
I have gone through this plugin, (AWS Lambda plugin) it requires AWS_ACCESS_KEY and AWS_SECREAT_KEY. It is mandatory in schema.
Can I go with out that?