Already supported by other version of playwright, see:
https://playwright.dev/docs/api/class-chromiumbrowser#chromiumbrowserstarttracingpage-options

I understand it is browser specific but it can be very useful for web performance auditing and testing, to be able to extract the trace.json file (with screenshots).

Can we extend the already Chromium specific features with tracing?
https://playwright.dev/python/docs/api/class-chromiumbrowsercontext