No recipe, but things that will add that umami flavor for you:
- mushroom powder
- tomato paste/powder
- soy sauce
- Worcestershire
- MSG
- fish sauce
- Maggi seasoning
Take any one of your favorite jerky recipes as add some or all of those to it.
I don't have ratios, but for my "Umami-Bomb Burgers" I use a blend of tomato powder, smoked garlic powder, onion powder, soy sauce powder, mushroom powder, ground mustard, MSG, salt, pepper, and a splash of Wooster and fish sauce. Would make a pretty good jerky marinade, could use paste/liquid form of soy and tomato instead of powder for jerky. Add cure, heat (chili flakes or powder) and liquid smoke (optional) to that and you're off to the umami races.
Hope that helps. I may or may not be off to dig a round roast out of the freezer to try this out now...