According to the section "Sharing Sites On Your Local Network" on laravel.com/docs/7.x/valet#sharing-sites
It states this:
If you wish to allow other devices on your local network to access the Valet sites on your machine via your machine's IP address (eg: 192.168.1.10/app-name.test), you will need to manually edit the appropriate Nginx configuration file for that site to remove the restriction on the listen directive by removing the the 127.0.0.1: prefix on the directive for ports 80 and 443.
I am now trying to understand how to add a nginx configuration file for a specific site. i.e, http://my-site.test/
(manually edit the appropriate Nginx configuration file for that site)