The following markdown code displays `::: {.cell}` `:::` tag, at least for `html` and `revealjs` format

```md
1. Expliquer les relations entre `a`, `b`, `d` et `e`.

    ```{r}
    #| echo: true
    #| eval: false
    a <- 1:10
    b <- a
    b -> e
    e <- d <- 1:10
    ```
```

```md
1. Expliquer les relations entre `a`, `b`, `d` et `e`.

    ::: {.cell}

    ```{r}
    #| echo: true
    #| eval: false
    a <- 1:10
    b <- a
    b -> e
    e <- d <- 1:10
    ```

   :::
```

To note, using `.r` works as expected.

Example: https://github.com/mcanouil/quarto-issues/tree/main/quarto-cli%23948
Version: `0.9.433`
2022-05-22T08:07:46Z
mcanouil
closed
Code cells "tags" displayed when indented (items list)
https://github.com/quarto-dev/quarto-cli/issues/948