code: def _get_regions_element(
      self,
      selected: List[str],
  ) -> ConfigMultiElement:
      element = ConfigMultiElement(selected=selected)
      for region_name in REGIONS:
          element.values.append(
              ConfigElementValue(value=region_name, label=region_name)
          )
      return element
  
imports: import json
  from typing import Dict, List
  import googleapiclient.discovery
  import googleapiclient.errors
  from google.auth.credentials import Credentials
  from dstack._internal.core.backends.gcp import GCPBackend, auth
  from dstack._internal.core.backends.gcp import utils
  from dstack._internal.core.backends.gcp.config import GCPConfig
  from dstack._internal.core.errors import BackendAuthError, ServerClientError
  from dstack._internal.core.models.backends.base import BackendType, ConfigElement, ConfigElementValue, ConfigMultiElement
  from dstack._internal.core.models.backends.gcp import AnyGCPConfigInfo, GCPConfigInfo, GCPConfigInfoWithCreds, GCPConfigInfoWithCredsPartial, GCPConfigValues, GCPCreds, GCPDefaultCreds, GCPServiceAccountCreds, GCPStoredConfig
  from dstack._internal.server import settings
  from dstack._internal.server.models import BackendModel, ProjectModel
  from dstack._internal.server.services.backends.configurators.base import Configurator, raise_invalid_credentials_error
label_desc: Use image node_id 8 for calling the GCPConfigurator obj's underlying member method code with example usage: obj._get_regions_element(selected) and returns: element