It's something I recall doing at a yoga class I took years ago, devoting the effort, the realizations and the calmness to a cause beyond ourselves. Back then one or two of my children were still in their teenage years, so I never had a lack of intention.
But I've realized today as I've pondered this practice (not during the meditation itself, oh no, never then; I'm not thinking about anything then!) is that it's familiar from even longer ago. It reminds me of something I was taught in my Catholic grammar school, which was to "offer up" our daily trials for the poor souls in Purgatory.
I'm not sure Purgatory is still a thing (a place?) anymore, but the notion of directing our collective effort toward a greater good very much appeals to me. It means that there is a reservoir of good will abroad in the land that we can add to and draw from as needed. And surely we could all benefit from that.