How to get Cognito App client Id and secret in Lambda

Serverless Framework
,
1

I have created Cognito Userpool and UserpoolClient.
CognitoUserPool:
Type: AWS::Cognito::UserPool
Properties:
AccountRecoverySetting:
RecoveryMechanisms:
- Name: verified_email
Priority: 2
UserPoolName: ${self:provider.stage}-user-pool
UsernameAttributes:
- email
MfaConfiguration: OFF
Policies:
PasswordPolicy:
MinimumLength: 8
RequireLowercase: True
RequireNumbers: True
RequireSymbols: True
RequireUppercase: True

CognitoUserPoolClient:
  Type: AWS::Cognito::UserPoolClient
  Properties:
    ClientName: ${self:provider.stage}-user-pool-client
    UserPoolId:
      Ref: CognitoUserPool
    ExplicitAuthFlows:
      - ALLOW_USER_PASSWORD_AUTH
      - ALLOW_REFRESH_TOKEN_AUTH
    GenerateSecret: true

Now I can access the UserPoolId and UserPoolClient Id by this method -
my_function:
package: {}
handler:
…
environment:
USER_POOL_ID: !Ref CognitoUserPool
USER_POOL_CLIENT_ID: !Ref CognitoUserPoolClient

By this I can refer UserPoolId and ClientId in lambda. But I need client secret also to create a secrethash in lambda. How do I access client secret in lambda?