How to get rust contract's ABI

Trying to build rust contract in vscode ( referring --> https://github.com/paritytech/pwasm-tutorial), when I build JSON file is not creating and ABI is not found.
All help appriciated.
TIA

What do you mean by “rust contract’s ABI”?
The ABI of Rust itself? Or something else?

I think this question is about ethereum contracts - it should be posed on parity’s github, IMO.