if i use deploy-time parameters like so:

def get_configs(context):
    return os.environ[CONFIG_ENV_NAME]

class ModelBuilder(FlowSpec):
    configs = Parameter(
        "configs",
        type=JSONType,
        default=get_configs,
    )

just confirming that the environment variable specified at the point in time i run

step-functions create

will be used? but i can still override the parameter if i want by specifying

--configs

when I run the step function?