How to use \textcircled in Rmarkdown?

How can I use \textcircled from the textcomp package in the text of an .rmd document?

I have tried using \( \textcircled{r} \) and \textcircled{r}. I would like to make html_document

---
title: "my doc"
header-includes: 
  \usepackage{textcomp}
output:
  html_document:
  pdf_document:
    keep_tex: no
---

\( \textcircled{r} \)
\textcircled{r}