There are Markdown code snippets for the RStudio IDE. Click the Tools > Global Options... menu; then click the code Code windowpane; then click the Edit Snippets... button; then click the Markdown windowpane; go to the bottom and paste this gist.

RStudio markdown snippets

# 2024-02-15

# quarto callout note
snippet con
	:::{.callout-note  appearance=minimal}
	${1:text}
	:::

# quarto callout tip	
snippet cot
	:::{.callout-tip appearance=simple}
	${1:text}
	:::

# quarto callout warning
snippet cow
	:::{.callout-warning appearance=simple}
	${1:text}
	:::

# quarto two-column display
snippet two
	:::: {.columns}
	
	::: {.column width="50%"}
	${1:left-content}
	:::
	
	::: {.column width="50%"}
	${2:right}
	:::
	::::

# quarto two columns with centered text
snippet twocenter
	:::: {.columns style='display: flex !important; height: 40%;'}
	
	::: {.column style='display: flex; justify-content: center; align-items: center; text-align: left;'}
	${1:left-content} 
	:::
	
	::: {.column style='display: flex; justify-content: center; align-items: center; text-align: left;'}
	${2:right}
	:::
	::::

# quarto slide speaker note
snippet note
	::: {.notes}
	${1:note}
	:::

# quarto new vs. old code
snippet no
	```{r}
	${0:code}
	
	```
	
	```{r}
	#| eval: false
	#| code-fold: true
	#| code-summary: "Original code"
	
	
	```

# quarto footer
snippet footer
	::: {.footer style="font-size: .2em;"}
	${0}
	:::

# quarto image
snippet image
	
	::: {}
	![](images/${0}){.nostretch fig-align="center" width=50%}
	:::

2022-08-23: Add quarto snips

2022-09-02: Add two column snip

2022-09-03: Added cot snip and instructions

2022-09-09: Add speaker note for a slide

2024-02-15 Added twocenter, no, footer, image