Prisma maybe? https://www.prisma.io/ https://www.prisma.io/ It's mostly part of a JS/TS ORM, but it uses a declarative schema language, and there are libraries

Prisma maybe? https://www.prisma.io/ https://www.prisma.io/ It's mostly part of a JS/TS ORM, but it uses a declarative schema language, and there are libraries in other languages to parse and process it. E.g. https://prisma-client-py.readthedocs.io/en/stable/ https://prisma-client-py.readthedocs.io/en/stable/