I created a side project ~3 years ago based on a similar idea.
It was before LLMs were a big thing, and AI could render the code relationships for you.
I started with go and java (the two languages I was using in my job) and built AST parsers that would extract the relationships between the classes and functions and draw them with graphviz. Then I created a filter syntax based on regex to filter the graphs.
I never followed through on the idea to a production ready version, but it helped massively as a personal tool when working on unfamiliar codebases.
The site is still here, but lots of it is probably broken by now..