Get Submission ID in ajax_callback hook / after submitAjaxForm

I'm looking to dig up the submission ID in code that I execute in the ajax_callback hook. My code looks approximately like this:

function webform_to_datalayer_ajax_callback(&$form, FormStateInterface $form_state) {

  /** @var \Drupal\webform\WebformSubmissionForm $form_object */
  $form_object = $form_state->getFormObject();

  if ($form_state->hasAnyErrors()) {
    $response = $form_object->submitAjaxForm($form, $form_state);
  }
  else {
    $values = $form_state->getValues();
    /** @var \Drupal\webform\Ajax\WebformSubmissionAjaxResponse $response */
    $response = $form_object->submitAjaxForm($form, $form_state);

    /* Right here there should be a submission, right? 
     * So how do I find the id?
     */    
    $response->addCommand(new DatalayerCommand('form_submit', $form_object->getBaseFormId(), $values));
  }
  
  return $response;
}

I imagine that after the submitAjaxForm call the submission should have been created, so I need a way to find the sid, and add it to my Command.