use this snippet to customize the facetwp selections html markup

facetwp-selections-html.js

//reference: \wp-content\plugins\facetwp\assets\js\front.js - Generate the user selections
wp.hooks.addAction('facetwp/loaded', function () {
    // add custom code here

    var selections = '';
    jQuery.each(FWP.facets, function (key, val) {
        if (val.length < 1 || 'undefined' === typeof FWP.settings.labels[key]) {
            return true; // skip this facet
        }
        var choices = val;
        var facet_type = jQuery('.facetwp-facet-' + key).attr('data-type');
        choices = wp.hooks.applyFilters('facetwp/selections/' + facet_type, choices, {
            'el': jQuery('.facetwp-facet-' + key),
            'selected_values': choices
        });

        if ('string' === typeof choices) {
            choices = [{ value: '', label: choices }];
        }
        else if ('undefined' === typeof choices[0].label) {
            choices = [{ value: '', label: choices[0] }];
        }
        var values = '';
        jQuery.each(choices, function (indx, choice) {
           //ensure every selected facet item is wrapped around a data-facet-[key] li element to leave other functionality intact
            selections += '<li data-facet="' + key + '"><span class="facetwp-selection-value" data-value="' + choice.value + '">' + FWP.helper.escape_html(choice.label) + '</span></li>';
        });

    });

    if ('' !== selections) {
        selections = '<ul><li><span class="facetwp-selection-clearall" onclick="FWP.reset()">Clear All</span></li>' + selections + '</ul>';
    }
    //console.log(selections);
    jQuery('.facetwp-selections').html(selections);

}, 12); //using a higher number will ensure this custom function executes after facetwp's default selections html function.

FacetWP hook are now starting with FWP instead of wp:

//reference: \wp-content\plugins\facetwp\assets\js\front.js - Generate the user selections
FWP.hooks.addAction('facetwp/loaded', function () {
    // add custom code here

    var selections = '';
    jQuery.each(FWP.facets, function (key, val) {
        if (val.length < 1 || 'undefined' === typeof FWP.settings.labels[key]) {
            return true; // skip this facet
        }
        var choices = val;
        var facet_type = jQuery('.facetwp-facet-' + key).attr('data-type');
        choices = wp.hooks.applyFilters('facetwp/selections/' + facet_type, choices, {
            'el': jQuery('.facetwp-facet-' + key),
            'selected_values': choices
        });

        if ('string' === typeof choices) {
            choices = [{ value: '', label: choices }];
        }
        else if ('undefined' === typeof choices[0].label) {
            choices = [{ value: '', label: choices[0] }];
        }
        var values = '';
        jQuery.each(choices, function (indx, choice) {
           //ensure every selected facet item is wrapped around a data-facet-[key] li element to leave other functionality intact
            selections += '<li data-facet="' + key + '"><span class="facetwp-selection-value" data-value="' + choice.value + '">' + FWP.helper.escape_html(choice.label) + '</span></li>';
        });

    });

    if ('' !== selections) {
        selections = '<ul><li><span class="facetwp-selection-clearall" onclick="FWP.reset()">Clear All</span></li>' + selections + '</ul>';
    }
    //console.log(selections);
    jQuery('.facetwp-selections').html(selections);

}, 12); //using a higher number will ensure this custom function executes after facetwp's default selections html function.