How to handle the `extra` field returned by the `archive/list` interface to obtain custom field information?
When using AnQi CMS for website content management, we often need to display more personalized data beyond the usual information such as title, summary, thumbnail, etc.This additional information, such as the author of the article, the model of the product, the release location, etc., is achieved through the powerful custom field function of Anqi CMS.How can we elegantly extract and utilize these custom fields when we obtain the document list through the `archive/list` interface on the front end?The answer is hidden in the `extra` field of the returned data