This is on the roadmap. Under the hood, the UI is a functional programming language, a bit like the Dhall configuration language, but with primitives for A/B testing, event logging and ML. So we'll have a code interface too for GitOps workflows.
We're using Hypertune at https://causal.app for a few months now and it's been great! We have a few feature flags in there but also some more complex typed data for our onboarding modals.