How can I let my customer select a plan with the Stripe Billing Portal?

This is what my customer sees when I redirect to the portal. But I want them to be able to select a plan and add a payment method themselves.

This is how I'm getting the URL:

  const session = await stripe.billingPortal.sessions.create({
    customer: req.body.stripeCustomerId,
    return_url: 'http://localhost:3000/app',
  });

I want the user to be able to select a plan, which I have as a Product: