With RO CSVI it is possible to import Joomla articles with images for fields image_intro and image_fulltext.
Confused on how to run the import of Joomla articles? You can learn about the each tab, what each tab do and how to run the import from I want to import Joomla articles document. There are few specific image settings available in Joomla content import template. With those settings it is possible to import an external image for Joomla content image fields.
The very first step is to create Joomla content import template by selecting Component as Joomla Content and Operation as Content.
In the import template on Images tab, set the needed settings. More about each setting can be learnt from I want to import Joomla articles document and under Images tab section.
Run the import. Example content is given below