I’d stick to using the host IP for communication between pods. It keeps the separation of different pods intact, makes it easier to add new services and if you ever get a second machine for containers you can continue doing it the same way just with a different IP.

You could probably build something like that, but I’m not aware of anything that does what you describe.

The AIO container is so terrible, like, that’s not how you’re supposed to use Docker.
It’s unclear whether OP was using that or saner community containers, might just be the AIO one.