How is the formation of full-text RSS in the format for export to Google Publisher Center?

In addition to standard RSS 2.0 elements, the special element "content:encoded" is required to export data to Google Publisher Center, which contains the full contents of the publication:
    <content:encoded>Full contents of the publication</content:encoded>

To include the full content of publications, the feed must use the additional namespace:
HTML-formatted text should be wrapped by CDATA section.
Our crawler extracts the full text of publications on web pages using an AI algorithm, as well as on pages marked up with markup (supported types: Article, NewsArticle, BlogPosting, LiveBlogPosting).