LinkML is a general purpose modeling language that can be used with linked data, JSON, and other formalisms
https://www.slideshare.net/cmungall/linkml-intro-july-2022pptx
https://docs.google.com/presentation/d/1-x-VEMSILTYzNjWqzqzAm2xKNb-Cw0j4dqaZiRRk8ec/edit#slide=id.g2ead4b2c614_0_34