Printing data from datasource terraform

I want to query datasource and print one field in the data in terraform. Example, for getting the service-account and printing service-account-email I tried below code which did not print anything :

provider "google" {
  region      = "region-id"
  project     = "project-id"
  version     = "~> 3.59"
}

data "google_service_account" "sa" {
  account_id = "testing-service-account"
}

output "compute-sa" {
  value = data.google_service_account.sa.email
}

Any suggestion please, how can I query and print the data.

thanks