Yes, you can use the Ripper module in DVDFab13 to extract the subtitles from DVDs/Blu-rays/4K Ultra HD Blu-rays.
To get separate SRT subtitle files with the output video, please set it to "Extract to SRT Subtitles" in the Advanced Settings > Subtitle Mode section in the Ripper modules.
If you want to output only SRT subtitles without the video, please use the SRT profile instead of those MKV/MP4 profiles.