How to use existing cloudwatch event rules?

Hi,
I could not find any documentation related to how we can use existing cloudwatch event rules via arns similar to how we can use existing sqs queues:

functions:
  compute:
    handler: handler.compute
    events:
      - sqs: arn:aws:sqs:region:XXXXXX:MyFirstQueue

I did find a serverless plugin related to this but haven’t gotten the chance to try it yet that too follows a similar approach:

plugins:
  - serverless-plugin-existing-cloudwatch-rule
 
functions:
  counter-lambda:
    handler: src/counter-lambda.handler
    events:
      - cloudWatchRuleArn: 'arn:aws:events:us-east-1:160879880353:rule/my-project-PDTMidnightSchedule-42UGHOTBBVIET'

What I wanted to know if there’s a way to do this without the use of any plugins? Maybe I am missing out on any piece of documentation that shows how we can do this?

Thanks in advance!