knowledge/document_page_project/views/project_project_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <record id="view_project_kanban" model="ir.ui.view">
        <field name="model">project.project</field>
        <field name="inherit_id" ref="project.view_project_kanban"/>
        <field name="arch" type="xml">
            <xpath expr="//div[hasclass('o_project_kanban_boxes')]" position="inside">
                <a class="o_project_kanban_box" name="%(action_document_page_projects)d" type="action">
                    <div>
                        <b>
                            <field name="document_page_count" nolabel="1" class="o_value"/>
                        </b>
                        <span class="o_label">Wiki Pages</span>
                    </div>
                </a>
            </xpath>
        </field>
    </record>

    <record id="edit_project" model="ir.ui.view">
        <field name="name">project.project.form - document_page_project</field>
        <field name="model">project.project</field>
        <field name="inherit_id" ref="project.edit_project"/>
        <field name="arch" type="xml">
            <div name="button_box" position="inside">
                <button class="oe_stat_button" type="action"
                    name="%(action_document_page_projects)d" icon="fa-book">
                    <field string="Wiki Pages" name="document_page_count" widget="statinfo"/>
                </button>
            </div>
        </field>
    </record>

</odoo>