This article will help you with using an SSL certificate for SQL Monitor.
IIS. We do not support the usage of SSL certificates with the built in webserver.
If you are using the built in webserver, you will first need to move to IIS. Please follow the documentation here for instructions on how to do this.
We then recommend that you follow Microsoft's guidance for setting up SSL on IIS: https://docs.microsoft.com/en-us/iis/manage/configuring-security/how-to-set-up-ssl-on-iis.