How to form the data attribute of the block depending on the selected options in the select list?

Question

JavaScript

I have a div which has a data attribute:

data-uniform-inline='{
"formConfig": "feedback", 
"fields": {
   "newsId": "{news-id}", 
   "field2": "value2",
   "field3": "value3",
}}'

And there are 2 select lists that have their own options
. How to make it so that when the first select list is selected, the value2 value changes? And the same with value3