Is the normal data from descriptions also included in the metadata by default, or do I need to consider them as separate as far as the search engines are concerned?

Hello,
 
It is desirable that you use separate descriptions for the search engine. You can use key words and phrases from descriptions in order to attract clients to your site.
 
Should you have further questions, please feel free to contact us.
 
Best regards,
ViArt Support Team