Extend page routing with custom parameters

In WordPress there is defined a simple routing

/%postname%/

So when I access /projects/ it loads me Projects page which has specified custom template_projects.php template.

Is it possible to extend routing but only for this template ?

Let’s say I want to extend routing to handle project id, so it should be:

/%postname%/%project-id%/

But other pages will work with base route.