oidc-agent for MacOS

How do I install these formulae?

brew install indigo-dc/oidc-agent/<formula>

i.e.

brew install indigo-dc/oidc-agent/oidc-agent

Or brew tap indigo-dc/oidc-agent and then brew install <formula>, i.e.

brew tap indigo-dc/oidc-agent
brew install oidc-agent

Documentation

brew help, man brew or check Homebrew's documentation.