step 3. create a npm package tarball, upload the zeppelin master host, unzip into the helium folder. I also updated the artifact to point to local npm folder (e.g. from email@example.com to /u01/helium/sogou-map-vis)
However, zeppelin's helium page does not list any viz packages.
Below post all indicate it is possible to use helium packages offline but it does not work for me: