How to create localizations with strapi.entityService?

It’s super easy to create localized items with the REST API as outlined here Internationalization (i18n) | Strapi Documentation.
However I am missing docs on how to do that with the Entity-Service.
I can pass a locale parameter to the data object when calling strapi.entityService.create. That will create an item in the given locale.
But I do not know how to “sync”/attach it to a previously created default-locale item.
Any Idea on how to do that?

Edit: Found an answer here How to create localized entries from code? - #14 by florianmrz