CSRF token for AJAX call in attached javascript file

I’m working in Codeigniter 4 with CSRF protection enabled. I have an AJAX call in an attached js file, and I can’t figure out how to generate the CSRF token. Previously, I have done it in php files with embedded js, but in the attached js file I can’t run php.

In the attached js file I have:

//makes a tooltip with description of analysis (header)
    $('.tbl-header').each(function () {
        makeHeaderInfo($(this))
    })

function makeHeaderInfo(header) {
        var analysis = header.hasClass('seed') ? 'Seedling ' + header.text().toLowerCase() : 'Sapling ' + header.text().toLowerCase();
        var posturl = baseURL + "forest_regen/getAnalysisDetails";
        var data = {};
        data['analysis'] = analysis;
//This is what I would do in a php file...
//       var csrfName = '<?= csrf_token() ?>'; 
//       var csrfHash = '<?= csrf_hash() ?>';   
//       data[csrfName]=csrfHash;
        $.when($.ajax({type: "POST", url: posturl, data: data, dataType: 'json'})).done(function (result) {
            var description = (result.fldDescription == null) ? 'No description for this analysis yet' : result.fldDescription
            header.children('.header-info').attr('title', description)
                    .tooltip({
                        trigger: 'click hover',
                        placement: 'top',
                        container: 'body'
                    })
        })
    }
    ;

I tried defining the variables in the php file which has this js file attached, but I get “csrfName is not defined.” I’m not sure how to pass the variables to the js file?

Is there a way to generate the csrfName and csrfHash in javascript or jquery? Or another way to accomplish this?

Thank you!