Comment by aussieguy1234

It's possible to configure DNS to make a public domain point to an internal IP and register a certificate for that domain.

For example, you can register a certificate for local.yourcompany.com and point local.yourcompany.com to 127.0.0.1 to get HTTPs locally. The same could be done for internal network IPs.

It wouldn't work well with Let's Encrypt because their bot would just end up talking to itself in this scenario.

Of course you could also use my side project (expose.sh) to get a https url in one command.