podman can work with kube files, which is the YAML format from Kubernetes. That's more "platform agnostic" than docker-compose. And it can be read as a documentation in the same way.
You don't have to learn much resource jargon for a quadlet, just the Pod type, and a relatively small subset of it at that (you're not going to be using things like selectors or priority classes). And there's a script that can convert a compose file to a quadlet, so you don't have to do it from scratch.
