Change the configuration for the token browser for a webform element.

example.module

/**
 * Implements hook_form_BASE_FORM_ID_alter().
 */
function example_form_webform_ui_element_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if ($form["properties"]["type"]["#value"] == 'example_element') {
    $form["token_tree_link"]["token_tree_link"]["#token_types"][] = 'node';
    $form["token_tree_link"]["token_tree_link"]["#recursion_limit"] = 4;
  }
}