Hi,
I recently discovered quadlet-nix since I wanted to get more into quadlets. While I liked the project, the porting process from compose files, etc., felt tedious. This is why I decided to write podlet2nix, a small utility to convert the output of podlet to a quadlet-nix compatible configuration. This tool is meant to be executed by hand and is not designed to be automatically fed into something else.
While it is still in its early stages and not really that tested (and currently lacks any tests :P), I just wanted to get this out to the community to hopefully help others in their process to move to quadlet-nix.
Enjoy! 
avocadoom