How to debug by step Native C++ Library with Unity Free?

Hi everyone, I have created a C++ dynamic library and I have linked it threw a wrapper to my unity project. The connection is working fine but the debug is a nightmare.... :( I would like to be able to debug (step by step) the library threw visual studio with Unity Free. In 2016, I was working with unity Pro and it was really easy to do it but I hope 3 years later, it is now possible to do it also with the Free version? Thanks for your help, Regards, Clément