Hi Andrea,
When you create the multi-option select field in the Knowledge Graph and fill in the available options, the platform automatically assigns an API name to each option. You can see that here in the Turtlehead Tacos example for the Restaurant Features field.
It’s not possible to edit these API names in the platform, but you can access the displayName property. The “slugified” version is under textValue. See Field under the Knowledge Graph API docs for more info.
