News Web Part Filter Not Available

I think the ability to filter on news across site collections is supposed to be coming at some point. What you can do now is use the Highlighted Content web part to pull in news articles from multiple site collections and then filter on a managed property. When I need to do this, I create a managed metadata property that I use on all of the sites I want to roll up and then map each property to an available managed property in the search schema (e.g. RefinableString05). Then I can filter the news based on that shared property - but for now, only in the Highlighted Content Web Part.