There isn't actually a tag for this at the current time, I'm afraid. Two years ago these images were rarely used, and that's when we chose the exact items of data from the feeds to process. We are looking into picking out ALL of the data and then making it all at your disposal from the templates, but as you can imagine it's easy to "break" stuff by adding such radical new features, so it has to be done slowly, with a lot of care.
I'll give it some thought as to how this could be done more quickly, but in terms of doing it, say, this week, there is no technique.