how to save and run custom script for microfab

How to save and run custom script for microfab is it as .JSON ? But I got error in export.
I am unable to understand this.
How or where to find a good tutorial to use microfab ?
I want to add custom fabric network in local , before it was easy with ansible but now IBM-blockchain-platform-vs code extension is not providing option to add such ansible environment .
How microfab is better than ansible .
In IBP-vscode extension change log it is mention that microfab is easy to add network.
Unfortunately I couldn't find a good tutorial to understand this microfab , how or where to get in depth documentation or tutorial for microfab

Environment:
IBM Blockchain Platform Extension Version:2.0.2
Visual Studio Code version:1.55.1
Environment name and version (e.g. Node.js v10.24.0, npm v6.14.11):
Operating System and version:Linux x64 5.8.0-48-generic snap Ubuntu 20.04 lts