"Dateline May 2018": Are you referring to an episode/segment of the show Dateline
How to best supply broad spectrum micronutrients I guess depends on your gardening style/goals. My goal is to provide the best habitat for as many organisms as possible and to have some produce in the process...
I count myself as lucky, because I've found the best way to provide all nutrients, including the micros is already satisfied by my number one goal, which is to provide habitat, i.e. heavy mulching for various animal/insect species, which not only use the mulch as shelter, but also as a food source and that processes all the nutrients I (my plants) require. And by mulching I mean using everything, not just leaves or woodchips, but all that and more; this creates a healthy biome, as opposed to a monoculture-type environment, like in the case of using just one type of woodchip for example.
However, there's another way I've been reading about lately and that's a type of gardening where you plant what's referred to as Nutrient Accumulators
. And as it happens to be, a lot of good nutrient accumulators are "weeds" and one of my favorite "weed"/nutrient accumulator is poke weed. https://www.tenthacrefarm.com/2014/08/5-weeds-you-want-in-your-garden/