How to add data when loading CI4 library

Sorry, I guess I misunderstood your question.
So you have your own library and want to rewrite it to work with CI4?

In that case, instead of

PHP Code:

$this->load->library('whatever', $config); 


you will do

PHP Code:

$whatever = new \App\Libraries\Whatever($config); 


Alternatively, you can also use service to get a single instance every time: https://codeigniter.com/user_guide/conce...vices.html

If that again not what you're asking for, I'm afraid you have to explain the question better.

michalsn.dev - mostly about CodeIgniter