really ugly workaround:
1st variable: list of cars, and “models” in csv ( i used inline, but you can use a url, and get a dynamic list)
2nd variable: json array of “models” and “prices”, then filtering by getting value from the 1st selected variable
result: one drop down showing cars to select, “price” returned from json array
This is not very elegant, and can probably be simplified, but it works, and it took a surprisingly long time to do such a “simple” task…