I just don't quite understand how this cert will be used?
When you import it through your browser, you can access them using https for now. But that's a self-assigned, you have to import the ssl to everybrowser which you use.
What about my existing SSL-enabled pages? Should I remove all auto-generated certs and let Laragon create them again?
Yeah i delete, and then create them again,
How does Laragon knows when it auto-generates new certs that it has to base them on my new root authority (the cert created and installed according to your solution)?
I guess we should ask directly to the master @leokhoa :p.