Angular module from Github, how to integrate in my module?

Summary

I'm looking for instructions on how to get a github-fork of a node_module integrated into my project, so I can use the module with my own modifications to it, without touching code inside node_modules/xyz.

Details / example / reason:

As an example I have found that angular/cdk drag and drop is quite nice, but has flaws. So I needed to change the code in node_modules/@angular/cdk/esm2015/drag-drop.js (which I don't want to)

Mostly, like with the cdk/drag-drop there's a github repository with source code. And of course, changing sth. inside node_modules is ultra stupid and obviously I'd prefer to fork the repository instead and then link my fork in the package.json or so (?!).

That said...
I don't know how right now.
I could not find any docs or blogs on this topic. I guess I must be choosing the wrong keywords ??!

What I'd like to ask for

Could someone please give a link to a page that explains this process in great detail or at least summarize the important steps ?

What's on my mind so far...
Where to put the repository relative to my project, can/must it be in a parallel folder ? In my main project how to link that new forked git module (is it in package.json ?) Do I need to separately precompile that forked git module after every change ? Which commands ? Or is there an option so that my main module/project compiles each change through the ng serve watch as well on development ?

from Angular module from Github, how to integrate in my module?