code: def _get_regions_element(
      self, selected: List[str]
  ) -> ConfigMultiElement:
      element = ConfigMultiElement(selected=selected)
      for r in REGION_VALUES:
          element.values.append(ConfigElementValue(value=r, label=r))
      return element
  
file_path: dstack/src/dstack/_internal/server/services/backends/configurators/aws.py
imports: import json
  from typing import List, Optional
  from dstack._internal.core.backends.aws import AWSBackend, auth
  from dstack._internal.core.backends.aws.config import AWSConfig
  from dstack._internal.core.errors import BackendAuthError
  from dstack._internal.core.models.backends.aws import AnyAWSConfigInfo, AWSAccessKeyCreds, AWSConfigInfo, AWSConfigInfoWithCreds, AWSConfigInfoWithCredsPartial, AWSConfigValues, AWSCreds, AWSDefaultCreds, AWSStoredConfig
  from dstack._internal.core.models.backends.base import BackendType, ConfigElementValue, ConfigMultiElement
  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 7 for calling the AWSConfigurator obj's underlying member method code with example usage: obj._get_regions_element(selected) and returns: element