code: def _get_backend_config(self, model: BackendModel) -> NebiusConfig:
      return NebiusConfig(
          **json.loads(model.config),
          creds=NebiusCreds.parse_raw(model.auth),
      )
  
imports: import json
  from typing import List
  import requests
  import dstack._internal.core.backends.nebius.api_client
  from dstack._internal.core.backends.base import Backend
  from dstack._internal.core.backends.nebius import NebiusBackend
  from dstack._internal.core.backends.nebius.config import NebiusConfig
  from dstack._internal.core.models.backends.base import BackendType, ConfigElementValue, ConfigMultiElement
  from dstack._internal.core.models.backends.nebius import NebiusConfigInfo, NebiusConfigInfoWithCreds, NebiusConfigInfoWithCredsPartial, NebiusConfigValues, NebiusCreds, NebiusStoredConfig
  from dstack._internal.server.models import BackendModel, ProjectModel
  from dstack._internal.server.services.backends import Configurator
  from dstack._internal.server.services.backends.configurators.base import raise_invalid_credentials_error
label_desc: Use image node_id 6 for calling the NebiusConfigurator obj's underlying member method code with example usage: obj._get_backend_config(model) and returns: NebiusConfig