I need to set a default value for the region(state) in the checkout page.

tried it using jQuery. it’s showing the value the field but it’s not saving.

require([ 'jquery', 'jquery/ui'], function($  ){      setInterval(function () {          if($  ('input[name="city"]').val() != 'Perth')         {             $  ('input[name="city"]').val("Perth");            $  ('input[name="city"]').attr('readonly',true);            $  ('input[name="city"]').trigger('keyup');            $  ('input[name="region"]').val("WA");            $  ('input[name="region"]').attr('readonly',true);            $  ('input[name="region"]').trigger('keyup');          }          },3000);  }); 

https://prnt.sc/i1jvx6

when I click save it not saving the region(state)

https://prnt.sc/i1jwgf

can anyone help me? it’s urgent

Thanks in advance.