[Python] How to assign a RGB background color to a Quarto dashboard valuebox?

Consider the following quarto dashboard:

---
title: "Test"
format: dashboard
---

```{python}
#| content: valuebox
#| title: "Test Box"
dict(value=10, color="red")
```




How can I define the background color of the valuebox dynamically using RGB colors? I am probably missing the correct syntax.

Doing it like this doesn't lead to the expected result:

---
title: "Test"
format: dashboard
---

```{python}
#| content: valuebox
#| title: "Test Box"
dict(value=10, color="background-color: rgb(255,0,0)")
```




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