Describe the bug

Using Fn.importValue method from aws-cdk-lib as input for IdentityPool.fromIdentityPoolArn or IdentityPool.fromIdentityPoolId will error out:

Error: Invalid Identity Pool Id: Identity Pool Ids must follow the format <region>:<id>

Expected Behavior

I expected for Fn.importValue to be a supported argument for fromIdentityPoolArn or fromIdentityPoolId static methods

Current Behavior

Using Fn.importValue('outputName') as ARN or Id arg throws out:

Error: Invalid Identity Pool Id: Identity Pool Ids must follow the format <region>:<id>

Reproduction Steps

// StackWithIdPool
import * as cognito_identitypool_alpha from "@aws-cdk/aws-cognito-identitypool-alpha";

const existingIdentityPool = new cognito_identitypool_alpha.IdentityPool(
  this,
  "IdentityPool",
  {
    identityPoolName: "some-id-pool",
    allowUnauthenticatedIdentities: true,
  }
);

new cdk.CfnOutput(this, "ExistingIdentityPoolArn", {
  value: existingIdentityPool.identityPoolArn,
  exportName: "existingIdentityPoolArn",
});

// AnotherStack

cognito_identitypool_alpha.IdentityPool.fromIdentityPoolArn(
  scope,
  'ExistingIdentityPool',
  Fn.importValue('existingIdentityPoolArn'),
);

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.110.1-1

Framework Version

No response

Node.js Version

18.13.0

OS

Windows 10

Language

TypeScript

Language Version

No response

Other information

No response