adding numbers to code blocks in RMD output - r-markdown

Question

I am trying to add line numbers to code blocks, but it's not working. I'm using the code attr.source='.numberLines' with Pandoc 2.11.4. but the output files omit the code numbers.
I've tried the options referenced in this question and also the documentation from bookdown, but the attr.source='.numberLines' is being ignored and it doesn't show up as an autofill option, like say echo= would.
What I want is something that looks like this (just the number part)
Thanks! I've tried this in two different applications of R studio, and it's not working in either.
An example of the code I'm using:
---
title: "example"
author: "plover"
date: '2022-12-29. Version: `r Sys.Date()`'
output:
html_document:
code_folding: show
highlight: tango
number_sections: false
df_print: kable
theme: flatly
toc: yes
toc_float: yes
toc_depth: '3'
word_document:
toc: no
pdf_document:
toc: yes
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```
Don't evaluate this code
```{r abc, eval = FALSE }
a <-1+1
b <-2+1
c = a + b
```
Don't evaluate this code, but show me the lines
```{r def, eval = FALSE, attr.source = '.numberLines' }
d <-3+1
e <-4+2
f = d + e
```
Evaluate this code, and show me the lines
```{r ghi, attr.source = '.numberLines' }
g <-3+1
h <-4+2
i = g + h
```

Answer 1

Try this. (Actually did nothing but comment out the yaml option code_folding: show)
---
title: "example"
author: "plover"
date: '2022-12-29. Version: `r Sys.Date()`'
output:
pdf_document:
toc: yes
word_document:
toc: no
html_document:
# code_folding: show
highlight: tango
number_sections: false
df_print: kable
theme: flatly
toc: yes
toc_float: yes
toc_depth: '3'
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```
Don't evaluate this code
```{r abc, eval = FALSE }
a <-1+1
b <-2+1
c = a + b
```
Don't evaluate this code, but show me the lines
```{r def, eval = FALSE, attr.source=".numberLines"}
d <-3+1
e <-4+2
f = d + e
```
Evaluate this code, and show me the lines
```{r ghi, eval=FALSE, attr.source=".numberLines"}
g <-3+1
h <-4+2
i = g + h
```