Hi,

For passing the value from the controller to the template, try to use the following code:

Python:# -*- coding: utf-8 -*-

from odoo import http

from odoo.http import request

class ExampleController(http.Controller):

    @http.route('/example', auth='public', website=True)

    def example(self):

        message = "Hello, World!"

        return request.render('your_module.example_template', {'message': message})

XML:

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <template id="example_template" name="Example Template">
        <t t-call="website.layout">
            <div id="wrap">
                <div class="container">
                    <h1 t-esc="message"/>
                </div>
            </div>
        </t>
    </template>
</odoo>

Hope it helps.