Converting a car seat from UK standards to US standards?

Baby S
I have this Joie convertible car seat that I love, and I'd like to bring it back to the U.S. with me when we move. But UK carseats don't have a chest strap, and I think you have to have the chest strap in the US. Does anyone know if there is a way to add a chest strap to make a car seat comply with US standards? I hate to leave it behind; it was pretty pricey!

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