How to create new Configs & Variables ?

The service supports and the documentation suggests that Configs and Variables resources creates methods (should) exist. Reviewing the documentation, I'm unable to find (expected?) create methods for these and reviewing the sources, it's unclear how these could be constructed.

Is it me? Or, are these methods missing?

"Create / interact with ... configs"
https://googlecloudplatform.github.io/google-cloud-python/latest/runtimeconfig/config.html

"Create / interact with ... variables"
https://googlecloudplatform.github.io/google-cloud-python/latest/runtimeconfig/variable.html

Confirm

gcloud beta runtime-config configs list \
--project=${PROJECT}

NAME      DESCRIPTION
exists    Description

gcloud beta runtime-config configs variables list \
--config-name=exists \
--project=${PROJECT}

NAME       UPDATE_TIME
exists     2017-08-29T15:03:26.359064036Z

Getters

from google.cloud import runtimeconfig
client = runtimeconfig.Client()

config = client.config("exists")
print (config.exists())
print (config.get_variable("exists").exists())

Results:

Setters?

config = client.config("create")
print (config.exists())
config.create()
print (config.exists())

Results:

    config.create()
AttributeError: 'Config' object has no attribute 'create'

print (config.exists())
variable = config.variable("test")
variable.create()

Results:

    variable.create()
AttributeError: 'Variable' object has no attribute 'create'