What is triggering the jquery to run? What element have you attached your JS to.
When using js you need to use field keys
What you need to do is find the current row.
// element represents an field
var row = element.closest('acf-row');
one you have the row then you find a field in the row, I a assuming a field of type “input”
var field = row.find('[data-key="your field key"] .acf-input input');