How to store raw content using property and value pair in content fragment?

Thanks all.

Try to come out a case to use the content fragment?

Thinking about an article, which has the article headline, body copy (summary can use variation to achieve), date,  authors. The content can be shared, then how to enter other data since these data are also reusable content.

I mean that if you want something like this in your site and you want to pull JCR data to populate the fields - the path you should take is to develop a HTL component.

The reason why i say this is because you can use Java in the back end to have app logic to read and write JCR data used to populate the view. THink of the front end as a view and the backend as a model and controller. 

Using Fragments, you do not have access to application logic like you do when writing a HTL component and WCMUsePojo.  If it was me writing this - i would write an HTL component as opposed to using Content Fragments.

since the component can't be dragged and dropped into the content fragment, only experience fragment. Do you mean I can use experience fragment for this case in order to store the raw data in the fragment?

This image looks more like an AEM component - such as a HTL component that can read and write data form the JCR.