In this video, Google Developers shows how to add custom site metrics to a lighthouse:
(from 17:58)
https://youtu.be/NoRYn6gOtVo?t=1078
Is plugin-lighthouse support that?
My end goal is to add those custom metrics to gitlab, to each merge request:

and I already learned, that sitespeed.io can be easily integrated with gitlab ci, and lighthouse can be integrated as a plugin with sitespeed.io :)