vertical-cooperative/easy_my_coop_fr/views/layout_template.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
	<data>
		<template id="layout_i18n_fr" inherit_id="theme_light.invoice_footer" name="French Layout Customization">
			<xpath expr="//t[@t-if='company.company_registry']" position="before">
				<t t-if="company.siret">
            		<span>Siret</span> :
            		<span t-field="company.siret"/>
           		</t>
			</xpath>
		</template>
	</data>
</odoo>