Hello @Ankur Bawiskar , 

We have used Advanced Ref qualifier  for SVP field. 

Here's the script include : 

var JobGroupMember = Class.create();
JobGroupMember.prototype = Object.extendsObject(global.AbstractAjaxProcessor, {
    getMembers: function() {
        var users = [];
        var groupName = this.getParameter('sysparm_organization');
        var gr = new GlideRecordSecure('sys_user_group');
        gr.addQuery('name', groupName);
        gr.query();
        if (gr.next()) {
            var groupSysId = gr.sys_id.toString();
            var members = new GlideRecordSecure('sys_user_grmember');
            members.addQuery('group', groupSysId);
            members.query();
            while (members.next()) {
                var mates = members.user.name.toString();
                users.push(mates);
            }
            return JSON.stringify(users);
        }
    },
    type: 'JobGroupMember'
});

Client script : 

function onChange(control, oldValue, newValue, isLoading) {
    if (isLoading || newValue == '') {
        return;
    }

    var line = g_form.getValue('organization');
    if (line == 'Commercial') {
        line = 'Job Request - Commercial VP/SVP';
    } else if (line == 'Finance') {
        line = 'Job Request - Finance VP/SVP';
    }else if (line == 'Graphic Solutions') {
        line = 'Job Request - Graphic Solutions VP/SVP';
    }else if (line == 'HR') {
        line = 'Job Request - HR VP/SVP';
    }
    var ga = new GlideAjax('JobGroupMember');
    ga.addParam('sysparm_name', "getMembers");
    ga.addParam('sysparm_organization', line);
    ga.getXMLAnswer(callback);

    function callback(response) {
        var answer = JSON.parse(response); {
            g_form.setValue("svp", answer.join(','));
        }
    }
}

Thank you.