Custom Package Dependency for Custom Package

I am working on developing some packages to be accessible through my git repository with the package manager. I'm able to successfully build the repository to be pulled from my git repo. My issue is that I have a second git repository that depends on the first git repository to function. I can't figure out the syntax for marking it a dependency. I'll try to explain better...

I have repo A. Repo A has no issue getting into the package manager system as it's a standalone package that doesn't depend on anything.

I have repo B. Repo B needs Repo A in order to function correctly. I'd like to put a dependency to Repo A in the "Package.json" file for Repo B, but the format for this is " 'name':'1.0.0' " And has no way to know that it's a custom repo or it's git URL.

I hope that this explains the situation better. Any help with this, or if it is currently possible will be very awesome!

Thanks!