Custom metrics for playwright monitors

[sevensolutions]

Is your feature request related to a problem? Please describe.
I'am using playwright monitors to monitor some websites where i need the flexibility to measure individual durations. Like login-duration, page-load duration etc.

Describe the solution you'd like
At the moment, a playwright test can only return a single value. It will be cool if i can return multiple values (metrics), which i can then use to attach some alerting rules to.
Each metric should also be shown in the overview (last value) and in the metrics tab (history).

Example API:

return {
    metrics: {
      loginDuration: endTime - startTime,
      pageLoadDuration: endTime2 - startTime2
    },
    screenshots: screenshots
};

Describe alternatives you've considered
At the moment i'am only using the single return value but i'am a little bit limited.