Run brew install openjdk@11
In case you are managing java versions with jenv, also run:
sudo ln -sfn /opt/homebrew/opt/openjdk@11/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk-11.jdk
jenv add /Library/Java/JavaVirtualMachines/openjdk-11.jdk/Contents/Home/