[GO][Question] Custom auth method

I am trying to create a custom auth method for Go client of an application. The auth method requires either to generate a new token every request, or to do it every x minutes. The token is generated locally and its generation can throw an error.
I tried to create a custom context, similar to this used in AccessToken Authentication, but I can only provide a static value, not a value which is generated every request.
As far as I uderstand, this code: https://github.com/OpenAPITools/openapi-generator/blob/14d41310b968b47bf2a6bc89bbc9c7dadffaca06/modules/openapi-generator/src/main/resources/go/client.mustache#L332-L376 limits my possibilities to provide custom auth method.
Is there any way to workaround this? If not, are you willing to review a PR containing code allowing to create custom auth methods (and if so, how would you want it to look like)?
Thanks in advance

Start with modules/openapi-generator/src/main/resources/go/client.mustache, especially lines 332-376, and compare the existing AccessToken Authentication handling described in the issue. Define the extension point needed for per-request or periodic token generation and error propagation; done means the requested custom authentication behavior is supported without relying on a static value.