How to get object references? (Rust SDK)

Hey! Hope you're doing well! I have a quick questions surrounding Rust SDK.

Let's say I have following KCL file:

schema File:
  name: str
  path: Path

schema Path:
  p: str

ext = "txt"
file_name = "hello.${ext}"
path = Path { p = "/tmp" }

f = File { name = file_name, path = path }

I need to extract references to other identifiers used in any field or value of given object, so for example, based on above file I need to get:

f -> ["file_name", "path"]
file_name -> ["ext"]

Now, I checked Rust SDK and even tried to find it in non-public APIs like Parser or Evaluator, but no luck. I'm slowly learning internals of KCL, but it's very complex and I'm feeling little lost.

Can you please share where can I get this information or at what level should I intercept compilation to get this?

Thank you in advance!