Hi, I would also like to add another tool I'm contributing to at work (cisco) called APIClarity [1]. It aims at reconstructing swagger specifications of REST microservices running in K8S, but can also be run locally.
This is a challenging task and we don't support OpenAPI v3 specs yet (we are working on it).
Feel free to have a look, and get ideas from it :)
We'll also be presenting it at next Kubecon 2022.