Glad to help. Some of the non-ISBN content I’ve read and tracked on StoryGraph is the mega-web-novel Worm and various interstitial PDF mini-stories that an author posted on their website as part of a continuing Sci-Fi series. All of this content on the service is user-input. All you would have to do is create the feature. When I discovered it, I realized how awesome it is to be able to track such content.

Remember - great artists steal. So go check out the community features on Literal and the tracking features and user-entry features on StoryGraph.