Feature request: check which nodes (installed/not installed) use a library

When considering installing a new set of nodes, I always check the requirements.txt list. I keep a list of libraries installed via pip list and can check to see if I already have or need to install them. But I can't see if a custom node set has a version requirement for those dependencies. I always get scared something will be broken when the requirements.txt has:
Some_library>=10.3.0
Some_other_library==1.1.2

It would so great to open the manager and search to see if my installed node has already Some_library==9.2 because then I'd know that will cause problems.

I have no idea how hard it would be to add this feature, or how difficult it would be to maintain, but something like that would be awesome.

No source file, test, or entry point is named. Start by reviewing the manager's handling of requirements.txt and pip-installed libraries, then determine how a search could compare node-set version requirements with installed versions; done means users can identify compatible and conflicting dependencies.

Written by the indexing model from the issue text.