Depending on the DSL you choose (JSON or Programmatic) you declare reactivity slightly different, but pretty much, we have states and inlined expressions.

If states didn't click initially that's fine, you can still cover a lot of ground using inlined expressions: https://golemui.com/dx/features/states/inline-when/

Basically you can nest the states, so you can build a tree of states that way.

Or you can leverage the DX to have fully reactive components.