Pipeline Shared libray location in a git repository

[JL 6BerYeti]

Reading the Jenkins Pipeline Shared Libraries page,  it seems that the library must be at the root of the git repo.
Working in a complex / constrained environment, I need to store my library in a continuousIntegration directory which is not at the root level.
I don' understand in the configuration page how I can achieve that, as far as it seems that it does not seem to offer the possibility to enter a directory path.

If I am wrong, any explanation would be appreciated. If I am right any suggestion would be welcomed.

Thanks for your help
Best Regards
J-L