I can import AWS resources using AWS CDK (python) like this
# lookup existing VPC
vpc = ec2.Vpc.from_lookup(self,"vpc",vpc_id=vpcID,)
#lookup existing Security group
sec_group = ec2.SecurityGroup.from_lookup_by_id(self,'SG',sgID)
I cannot find proper documentation or example of doing the same in terraform cdktf
CDKTF(Terraform) provides data sources to fetch information from resources created outside of Terraform, therefore you can use the DataAwsVpc
method.