Source code: class diagram generator

Hello,

Is there a tool or application(s) that automatically generates a class
diagram from source code?

Google search suggests rather inefficient ways to do it and mostly manual
labor that would take weeks to complete. I tried AI chats and they pretty
much suggested the same methods. Basically, using VScode with a UML
extension and manually telling it to add each class and link it....yikes! I
also looked into the build systems such as GN, bazel, make, and search for
any packages like rust's crates, ruby gems, npm, etc. I hope I'm not
wasting my time and looking for a unicorn.

Best,