How to add external library sources for reference, a remote development project

My project is linked to another library. I have this library source files.

I'm using remote development.

I can put the source files wherever I want on the remote server - now they are in /usr/local/src/my-lib/. Though they shouldn't be part of the project.

How do I jump and navigate to these library source files (for reference purposes)?

I can't get CLion to recognize them. I didn't find a way to add more "external library files" (as it automatically finds the .h files in the header search path)

Thanks