Passing role arn to step function API Trigger

Serverless Framework
1

Description

  1. As part of use case i am deploying step function which triggers multiple lambda function. To trigger step function i am enabling API Trigger.
  2. I pre created role with required permission and passed the role ARN for lambda function. This worked!!!
  3. I was able to do the same for step function (Passing an existing role ARN). This Worked!!!
  4. But the same is not working for API Trigger. It is not able to consume existing Role , it is asking for IAM permission to create a new role for API Gateway service to invoke step function.
  5. I do not want serverless framework to create roles as i would like to pass an existing roles as part of security restrictions
    Is there way to pass an existing role to API Gateway as part of step function trigger?