Pass an include parameter in Pug template from ExpressJS?

I'm new to Pug and ExpressJS and can't figure out how to do a simple thing: passing a template path from Express to Pug.

Here's an example of what I have in mind, with the variable named pageContent :

./app.js

app.get('/', function (req, res) {
  res.render('index', {title: 'Some Title', pageContent: 'includes/somePage.html'})
})

./views/index.pug

html
  head 
    include includes/head.html
    title= title
  body
    include includes/header.html
    include #{pageContent}
    include includes/footer.html

Any idea what I am missing ? Thank in advance for your help !

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