The main function of iPhone Data Recovery is to recover and back up lost data to your computer. But now it doesn't support importing recovered files to Apple iOS devices directly. However, if you want to import files to your iOS device again, we recommend FonePaw iOS Transfer or DoTrans which can transfer the recovered files back to your device and manage contacts, music, photo, movies, etc. as well.
As for WhatsApp chats, you can import it to iBook but not the WhatsApp app. Here is the guide for you to transfer WhatsApp chats back to device:
1. Please open the recovered file, and then open WhatsApp.
2. Then open the HTML file and you will see the WhatsApp dialoge is opened on html page.
3. Then click "Ctrl"+"P" on your keyboard at the same time. Then you will see a print setting page. You choose "Save", and the google chrome will save the PDF file on your computer.
4. Then please open FonePaw iOS Transfer. And choose the PDF file. After that, you can see the dialoge on the iBook app on your iPhone.