Settings.php access for environment_indicator.switcher_xxx_environment

Problem/Motivation

I want to be able to change the URLs for each environment based on settings defined in the site's settings.php

Currently, setting environment_indicator.indicator variables works (eg: $config['environment_indicator.indicator']['name']='DEV';),
but setting switcher values (eg: $config['environment_indicator.switcher.dev_environment']['url']='http://www.google.com';) does not.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes