How to reference variable from environment variable and fallback to default value as a ref one?

Provider: AWS
I have the following resource in serverless.yml

resources:
  Resources:
    MyQueue:
      Type: AWS::SQS::Queue
      Properties:
        QueueName:${self:provider.stage}_my_queue

What I need to do is to reference an environment variable from .env file and fallback to ref MyQueue if .env file is missing that key.

referencing a resource is like this

MY_QUEUE:  { Ref: MyQueue }

how we can do it like this

MY_QUEUE: ${env:MY_QUEUE, {Ref: MyQueue} } # this not valid one

Begin with the serverless.yml variable expression and the .env lookup described in the issue, then examine how AWS CloudFormation Ref values are represented in Serverless configuration. Done means establishing whether a supported fallback syntax exists and, if this repository should demonstrate it, documenting the working example.