How to import third party gradle cache?

Question

gradle

The bottom line is, a java project with a bunch of dependencies, it needs to be built, but most of the repo with them is not available.
The files themselves are in someone else's cache, which is also fully available, but:
1) OS versions are different, you need to import on windows, a cache from Linux.
2) Being simply copied to where gradle put its cache, it remains completely invisible to gradle.
Is it possible to import it at all, if so, how?