Exposing prometheus exemplar metrics with auto-instrument

[Medeti Vamsi Krishna]

Hi,
May I know how can I auto-instrument the java code for exposing metrics along with exemplars?
I tried the procedure mentioned here: https://github.com/prometheus/client_java/blob/master/OTEL_EXEMPLARS.md. But in the code, it looks like we have to create the metrics and add the instrumentation before every call.

It is mentioned here: https://github.com/prometheus/client_java/blob/master/OTEL_EXEMPLARS.md, that we can add the exemplars without changing the code. But May I know how to do that?