cset command is a bit picky, but with a few command line options, we can get it to import a yaml file into our site's config:
drush -y --format=yaml cset config.entity.string '' - < config_file.yml
This will put the entirety of
config_file.yml into the configuration entity
-y is required because
drush will ask you if you want add a new entity (and of course you do!). The "trick" if it even is that, is the
'' before the
- to read from STDIN.