Create custom CMS block with Vuejs in App from v6.4.4

Hello everyone, I have a question could you help to answer.
I saw v6.4.4 support create CMS block by Vuejs (link) for App, I tried to create main.js and custom block in Resources/app/administration/src, then run ./psh.phar administration:build, but it didn’t work. Do I wrong something?