Using paragraph in tbl-cap or fig-cap cell options do not work and nothing prevents it

---
title: "Example"
format: html
keep-md: true
---

```{r}
#| label: tbl-test
#| tbl-cap: |
#|    Big table 
#|    
#|    Really small

knitr::kable(
  mtcars[1:6, 1:3]
)
```

I don't think this should be supported - and thus nothing prevents a rendering to a broken doc

Intermediate Md is

---
title: "Example"
format: html
keep-md: true
---


::: {#tbl-test .cell tbl-cap='Big table

Really small'}

```{.r .cell-code}
knitr::kable(
  mtcars[1:6, 1:3]
)
```

::: {.cell-output-display}


|                  |  mpg| cyl| disp|
|:-----------------|----:|---:|----:|
|Mazda RX4         | 21.0|   6|  160|
|Mazda RX4 Wag     | 21.0|   6|  160|
|Datsun 710        | 22.8|   4|  108|
|Hornet 4 Drive    | 21.4|   6|  258|
|Hornet Sportabout | 18.7|   8|  360|
|Valiant           | 18.1|   6|  225|


:::
:::

See how the new line in YAML will break the line on the fenced div attributes, creating an unsupported syntax