social/mail_sendgrid/views/email_template_view.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <!-- Form view -->
    <record id="view_email_template_sendgrid_form" model="ir.ui.view">
        <field name="name">sendgrid.sendgrid.form</field>
        <field name="model">mail.template</field>
        <field name="inherit_id" ref="mail.email_template_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='email_from']/ancestor::page" position="after">
                <page string="SendGrid">
                    <group>
                        <field name="sendgrid_template_ids">
                            <tree editable="top">
                                <field name="lang"/>
                                <field name="sendgrid_template_id"/>
                            </tree>
                        </field>
                        <button name="update_substitutions" string="Get substitutions from templates" type="object" colspan="2"/>
                        <field name="substitution_ids">
                            <tree editable="top">
                                <field name="key"/>
                                <field name="lang"/>
                                <field name="value"/>
                            </tree>
                        </field>
                    </group>
                </page>
            </xpath>
        </field>
    </record>
</odoo>