thanks for your tip. The V2 API seems to be the extension for the V1 API.
I was trying to search for a URL to a swagger or open api json definition. Something like OpenAPI Specification - Version 2.0 | Swagger in order to be able generate client code for the SonarQube in this case.
We are actually looking into realizing some kind of converter from the ${SONAR_URL}/api/webservices/list plus ${SONAR_URL}/api/webservices/response_example to a swagger.json in order to be able to generate client code for different languages (like go and python in our case).
The endpoint you are looking for is: <your sq instance>/api/v2/api-docs. Please note that it might move in the future, this is why it is not yet clearly documented.