Everything that ACF provides is pretty much documented here https://www.advancedcustomfields.com/resources/adding-custom-javascript-fields/ and there are no setting/getting functions that you can call from javascript. As it currently stands we are on our own for this, perhaps in the future there will be something added.
Don’t know if this will interest you, but I have a few examples to dynamically updating fields here https://github.com/Hube2/acf-dynamic-ajax-select-example. I’m also in my spare time working on my own js extension for ACF that will do this type of thing, but it’s a slow process because I don’t really have a lot of spare time.
