How to assign multiple arn/cognito pools to a single api in serverless.yml

The AWS Console does allow multiple cognito pools to be assigned to a single api in API Gateway… How can this be accomplished in serverless.yml . Below doesnt works… Pls provide working example. Thank you

functions:
create:
handler: create.main
events:
- http:
path: notes
method: post
cors: true
authorizer:
arn: arn:aws:cognito-idp:us-east-1:xxxxxxxxxxx:userpool/us-east-1_abcdfgth
arn: arn:aws:cognito-idp:us-east-1:kkkkkkkkkkk:userpool/us-east-1_abcdfgth