Objective observation is really hard, but amenable to systems and rules that help get closer to this ideal. I'm convinced it's possible to do far better than existing news organisations do just through approaching it with an engineering mindset.
There is no way to judge whether or not you are close to some objective view of “unbiased news”. So it is not a worthwhile pursuit.
As others have noted, what is “newsworthy” is an entirely subjective prioritization of events and information. Are four deaths in Riverside news? Are four deaths in Palm Springs? Are both? Are neither? It depends on your subjective priorities, as a consumer, and no single news organization is ever going to achieve universal, subjective, but somehow unbiased news prioritization.
Labeling anyone person or group’s prioritization of information as “truth” is a dubious endeavor. Dubious to the point of being laughable.
To be even 90% unbiased is 90% better than a sensationalist source.
I'm sure we can get very close to 100% as LLMs progress and if more talented people contribute to the project.