There is actually a parallel technique nearing the finish line that does sort of this. The gene they moved though is from wheat not another tree species, but still seems to give great blight resistance. Currently the barrier to it is entirely regularity. I believe it would be one of the first plants approved to just be released into the wild without something to prevent it reproducing naturally. The normal anti genetic engineering types are very opposed, but it seems likely it will get approved in the next few years.

https://www.nytimes.com/2020/04/30/magazine/american-chestnu...