Add french departments list options

I think this list of options is very useful but too specific to be included in the Webform module, so I created this documentation page where additional options can be listed.

I think this list of options is very useful but too specific to be included in the Webform module, so I created this documentation page where additional options can be listed.

The documentation is not available anymore (404) How to import additional options?

Documentation was updated a few week ago

@see https://www.drupal.org/docs/8/modules/webform/webform-cookbook
@see https://www.drupal.org/docs/8/modules/webform/webform-8x-5x-cookbook/opt...

I looked at the documentation and it's still not clear to me :). I found the section with the yml file but I don't know how to
add webform.webform_options.french_departments.yml into the autocomplete list.

Should I add the file to the "config\install" directory and install webform again?

Enlarging the discussion, I need to add a custom autocomplete text field: the list of France' cities which are today in my database in a specific table. What is the best way to do it with Webform ?

1) Should I create a yml file (an do the same process as above - when I understand it :))
2) can I hook the autocomplete?
3) can I create the plugin/module to add my autocomplete field?

I'm struggling with the same issue. I need to create a series of very long 'options', and I definitely don't want to go through the form
/admin/structure/webform/settings/options/manage/add

How do I include the .yml-files as options? A brief clarification would be much appreciated, I'm sure it's easy.
TIA, Dirk
PS Webforms is really great!