Rmarkdown: How to align static and dynamic text

I would use a table. If you don't draw the lines, it will look like text

---
title: "Untitled"
output: pdf_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

## R Testing

```{r echo=FALSE, include=FALSE}
df<-data.frame(let=c("a", "AAa", "BnhB", "jpoiölojk"), num=c(1, 23, 1, 9837))
```

\begingroup
\bfseries%
\noindent%
\begin{tabular}{@{}lll@{}}
First line: & `r df$let[1] ` & `r df$num[1] `\\
Second line: & `r df$let[2] ` & `r df$num[2] `\\
Third line: & `r df$let[3] ` & `r df$num[3] `\\
Fourth line: & `r df$let[4] ` & `r df$num[4] `\\
\end{tabular}
\endgroup