Not sure if I'm addressing your point correctly, but Kardinal does have the concept of external services and provides a plugin system that allows you to manage stateful external services. Here is an example [1] of a plugin to manage Neon [2] (a serverless Postgres DB with support for branches). You can find more information about plugins here: https://kardinal.dev/docs/concepts/plugins
[1] https://github.com/kurtosis-tech/neondb-plugin [2] https://neon.tech/