How to set TargetId (possibly function name) for a scheduled event rule from Serverless.yaml

Serverless Framework
1

How to set TargetId (possibly function name) for a scheduled event rule from Serverless.yaml

Here is a snippet from my Serverless.yaml

functions:
testLambdaModified:
handler: handler.testingingLambda
timeout: 300
events:
- schedule:
name: newestTestRule
rate: cron(0 12 5 4 ? 2005)

Please let me know how I can set a target id here.