Tinyproxy
https://github.com/tinyproxy/tinyproxy/releases
Free Open source Upstream Http/s, socks4/5, direct redirection per site/URL/domain with regex. Can set default upstream proxy for everything else.
Invisible proxy Reverse proxy
Command line / simple text config
It’s in your distros repo
It’s available in termux.
It works.
A) B) n B)