Try following code in your XML:

<field name="your_html_field" type="html">
                <p class="oe_view_nocontent_create">
                    Create a Quotation, the first step of a new sale.
                </p><p>
                    Once the quotation is confirmed, it becomes a sales order.
                    
                </p>
            </field>

This is an example from action which will work same way in your case.