Change font size and color inside YAML author

---
title: "Title"
author: |
    | Author One 
    |  Author Two 
    | 
    | Change font size and color
output: 
  bookdown::pdf_document2:
    number_sections: false
---

Above is my YAML.

I want to change the font size to a smaller one and change its color for the last part in author:.

The only relevant suggestion I found is this r - How to change the font color of title, author, date and make it bold in yaml of Rmarkdown? - Stack Overflow

But it doesn't render for me.

Searching for rmarkdown pdf title size on the internet gives me (you?) some clues.
E.g. this stackoverflow article or the PDF section in the rmarkdown cookbook.
As always: standard reports are easy to make but customized reports can be easy or difficult
(depending on your luck).

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