How do I source an XML file in jquery autocomplete?

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I have a form on power portal that I have been trying to add an autocomplete function to the text field. I need the options to come from a table in the dataverse.

I think it is in an XML file. How do you source this? Thanks for any help.

What I have tried:

$(function () {
    $("#pn_deactivatepositionnumber").autocomplete({
        source:
        $.ajax({
            method: "GET",
            url: "",
            data: { 
                id: "#cr598_position"
                },
            dataType: "html"
        }),
 
        request:done(function( msg ) {
         $( "#log" ).html( msg );
        }),
 
        request:fail(function( jqXHR, textStatus ) {
         alert( "Request failed: " + textStatus );
        }),        
     });
});