I need to pass `objects` to `email_template` from python code:

***.py**

    def _alert_product_expiry(self):

        alert_data = self.search([('alert_date','=',fields.Date.today())])

        if alert_data:

            template_id = self.env.ref('alert_email_template')// Need to pass `alert_data` to template

            send = template_id.send_mail(self.id, force_send=True)

**template_body**

      <field name="body_html">

            <![CDATA[

           //Retrieve that object here and perform for loop. I don't know how retrieve it.

    ]]>

   </field>

How can i do it?