whatsapp_web_groups/helpdesk_extras/views/website_helpdesk_form.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <!-- Extend helpdesk ticket form to add blocking logic when no hours available -->
    <template id="helpdesk_ticket_form_block" name="Helpdesk Ticket Form Block" inherit_id="website_helpdesk.ticket_submit_form">
        <xpath expr="//form[@id='helpdesk_ticket_form']" position="attributes">
            <attribute name="class" add="s_helpdesk_form_blockable"/>
        </xpath>
        
        <!-- Add blocking message div -->
        <xpath expr="//div[@id='helpdesk_section']" position="inside">
            <div id="helpdesk_form_block_message" class="alert alert-warning d-none" role="alert" style="margin-bottom: 20px;">
                <strong>Información:</strong> <span id="helpdesk_form_block_message_text"></span>
            </div>
        </xpath>
    </template>
    
</odoo>