I have looked into this, unfortunately like I said above, I’m not too familiar with the JavaScript side of ACF.
To be completely honest, I would likely to this the hard way. I’d set up a select field that I dynamically load the values for.
http://www.advancedcustomfields.com/resources/dynamically-populate-a-select-fields-choices/
Then I’d display the second values, also loaded dynamically and use conditional logic based on what choice was made in the select field.
