What are the frontmatter options for a intro layout ?

[Lothindir]

I want to use the intro layout and put the author and the date in my first slide. On the wiki there is the intro layout, but no information on how to use it. I tried with some common keys to no avail.

---
# ...
title: "My presentation title"
author: "The Author"
date: 1/09/2023
# ...
---

# My Title

Do anyone know where to find the information ? Thanks a lot !