Having read this https://github.com/go-lang-plugin-org/go-lang-idea-plugin/blob/master/Missing%20ENV.md
As is
% echo $USER
otiai10
% echo $GOROOT
/Users/otiai10/go
% echo $GOPATH
/Users/otiai10/proj/go
% which setenv
setenv not found
% cat /etc/launchd.conf
launchctl setenv GOROOT /Users/otiai10/go
launchctl setenv GOPATH /Users/otiai10/proj/go
%
and IntelliJ returns...
In addition...
It was a vain effort...