Is there any plugin that provides necessary API that I can build a customized UI on top of it

[Weihong Xu]

A lot of Jenkins page, like /flowGraphTable is rendered by server side. I was wondering is there any rest API that allow me to build customized UI with?

I try to search through the internet and only found a very simple one

jenkinsci/pipeline-restful-api-plugin: Provide the API endpoint for Jenkins CLI (github.com)

I know that BlueOcean uses the  separated backend and frontend design. But it also claim that  `The Blue Ocean REST API is a "private API" designed for the Blue Ocean user interface. It may change without notice at any time`

blueocean-plugin/blueocean-rest at master · jenkinsci/blueocean-plugin (github.com)

It would be great to have a general purpose APIs that we can use to get necessary data to build our own UI. It would be appreciated to shed me some light.