brew install unbeatable-101/sshwifty/sshwifty
Or brew tap unbeatable-101/sshwifty and then brew install sshwifty.
An example configuration file is installed for you at /opt/homebrew/etc/sshwifty/sshwifty.conf.json (ARM Macs) or /usr/local/etc/sshwifty/sshwifty.conf.json (x86_64). In addition, a service can be started with brew services start sshwifty to automatically start sshwifty at login, with the configuration drawn from the aformentioned file.
See https://github.com/nirui/sshwifty for more info on configuring sshwifty
brew help, man brew or check Homebrew's documentation.