Feature request: add support for Angie fork of NGINX on backend

Hello.

Is your feature request related to a problem? Please describe.
This feature request is related to global problem with NGINX development.
The owner of NGINX - F5 aim to recreate NGINX to a cloud based platform.
Community edition NGINX roadmap is inaccessible at the moment (since 2021).

Describe the solution you'd like
The solution would be to add several additional backend proxy managers for NPM.
As a notable one is Angie (or Awesome NGINX) - it supports many features NGINX lacks for now (for example - proxy HTTP/2/3 to remote server, not only HTTP/1.1, or ACME client for SSL certificate issuing and renewal automation, also it has an integrated API which makes integration to other systems easy enough).
Link for the Angie project.

Describe alternatives you've considered
There are many alternatives to NGINX, but as most compatible candidate Angie is most notable - it is a fork of NGINX that supports all NGINX features and configuration style and packs much more as well.

No files, tests, or entry points are named. Start by locating the existing backend proxy-manager integrations and compare their support boundaries with Angie; clarify the intended Angie capabilities and acceptance criteria before estimating the work. Done means Angie is supported as an additional backend proxy manager.