Atlasteam, Jira, plugin JsIncluder. Set assignee. For https://atlasteam.ru/?p=1925

Jira-JsIncluder-example-set assignee.js

(function ($) {
    setAssignee('admin');

    function setAssignee(name) {
        var setValue = name;
        var $field = $("#assignee");
        $.get(AJS.params.baseURL + "/rest/api/latest/user", {
            username: setValue
        }, function (data) {
            $("#assignee-single-select").remove();

            var option = $("#assignee").find("option[value=\"" + setValue + "\"]");
            if (option.length === 0) {
                option = $("<option></option>");
                option.text(data.displayName);
                option.attr("value", data.name);
                option.attr("data-field-text", data.displayName);
                option.attr("data-icon", data.avatarUrls["16x16"]);
                option.attr("data-field-label", AJS.format(
                    "{0} - {1} ({2})",
                    data.displayName,
                    data.emailAddress,
                    data.name
                ));
                $("#assignee-group-suggested").append(option);
            }
            $field.val(setValue);
            option.attr("selected", "selected");

            var picker = new JIRA.AssigneePicker({
                element: $field,
                editValue: setValue
            });

            $("#assignee").trigger('set-selection-value', setValue);
        });
    }
})(AJS.$)