[question] How can I get sub graph of a dependency in a recipe?

### What is your question?

I need to find libs in topological order of a dependency (openssl) and its dependencies, in order to get their libs, lib dirs, include dirs, defines, system libs/frameworks so that I can patch a CMakeLists for check_symbol_exists() (for the well known bug in targets defined by CMakeDeps not working with these functions: https://github.com/conan-io/conan/issues/12012 & https://github.com/conan-io/conan/issues/12180).
I don't want the full graph (other unrelated dependencies of this recipe), and I don't want only cpp_info of openssl (I need also its dependencies (there might be zlib depending on an openssl option)).

How can I do that with self.dependencies?

### Have you read the CONTRIBUTING guide?

- [ ] I've read the CONTRIBUTING guide