Somewhere between a Data Catalogue / BI tool and Magda. https://demo.dev.magda.io/ sending you a link because they have a nice demo UI (which I really think you guys should do on something like Digital Ocean for Kern with a demo dataset), go to add dataset on the top right

Have you guys already checked out "Datasets for Datasheets"? https://arxiv.org/pdf/1803.09010.pdf It is arguably not the most fascinating paper you'll ever read, but I think that many of the concepts introduced are actually super helpful in documenting your data. Have you implemented something similar in your projects so far? Would be really interested about that 🙂