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I suggest reading everything to understand it, but only this part is necessary: ​​Providing substitutions from modules

You should only look for the configuration that you want to replace at run time and do so based on the current user role.

The zone configuration template you are looking for is: field.field.entity_type.bundle.field_name

Auto_create is under 'settings / handler_settings'.

HOW TO FIND AND EXAMINE THE CONFIGURERS YOU NEED

Configs are also entities. They can be synchronized with EntityTypeManager. To see what kind of entities you have in the system, you have the method "getDefinitions ()". Then all you have to do is find the proper storage (getStorage ($ config_entity_type)) and load it by ID. Printing it with kint will give you a good idea of ​​how the entity looks and how the settings are stored.

You can also "drush cex" your configuration. In this case, the configuration files will be created. The same scheme can also be found here. This also gives a good overview.