FWIW if someone wants a tool like this with better support, JetBrains has defined a .http file format that contains a DSL for making HTTP requests and running JS on the results.

https://www.jetbrains.com/help/idea/http-client-in-product-c...

There's a CLI tool for executing these files:

https://www.jetbrains.com/help/idea/http-client-cli.html

There's a substantially similar plugin for VSCode here: https://github.com/Huachao/vscode-restclient