When will Bridge also import RAW files?

So you select a folder containing RAW files and what happens? What type of RAW files are they (file extension)?

Sony ARW raw file support depends on Camera Raw support for Sony ARW. There are two parts to the answer.

Most Sony ARW raw files work fine already. I have two Sony cameras and their raw files appear in Bridge. But the raw data changes with each new camera, so if you have a more recent model, Adobe Camera Raw might not support it yet. So this is the question about the first part of the answer: Which Sony camera are you having trouble with, it is a newer one? And also, did the camera save the file in any of the compressed raw Sony formats?

The question about the second part of the answer is: Because specific camera support depends on the Adobe Camera Raw version, what is the version of Camera Raw installed on your computer? This is important for anyone with a Sony A7V camera and who set the camera to save raw files in any of the Compressed raw formats. If the Sony raw files you are having trouble with are in any of those compressed raw formats from the A7V, make sure you have updated Camera Raw to the latest version. I think A7V compressed raw support was added in Camera Raw 18.3.

So, which Sony camera model are you using, and which version of Adobe Camera Raw?

I don't understand what you are attempting to do. Bridge does not import anything. It is not a database but a browser which shows you what you have on your drives.  Can you explain more fully what it is that you are trying to achieve and what is going wrong?