'Ajax overwrite serialized data

I want to overwrite a serialized json array from a form, and for every user input in the json array I want to transform the user input : from this

{
 incident: [ '112', '911' ],
  //...

to this one :

{
 incident: [ 'predifinedtex112', 'predifinedtex911' ],
 /...

I use ajax for trying this one, but is not working:

$(document).ready(function() {
    if ($("#formid").length) {
        $("#formid").submit(function(event) {
            var form = $(this);
            var formData = new FormData(form);
            formData.append('incident', 'www.google.com')
            var url = form.attr('action');
            $.ajax({
                type: "POST",
                url: url,
                data: formData.serialize(),
                //other code...

How can I pre process this before sending the form?

jqueryajaxformsserializationbackend


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