odoo16/addons/survey/data/res_users_demo.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data noupdate="1">
        <!-- Grant survey permissions to demo user -->
        <record id="base.user_demo" model="res.users">
            <field eval="[(4, ref('group_survey_manager'))]" name="groups_id"/>
        </record>
    </data>
</odoo>