What is the correct syntax to enable long captions (longer than a single line) in diagrams?

[Rockgecko]

The following is a minimal example of what I am trying to do:

---
title: "Test doc"
format:
  pdf:
    toc: false
    number-sections: true
    colorlinks: true
    documentclass: scrartcl
    papersize: A4
jupyter: python3
---

```{mermaid}
%%| label: fig-components
%%| fig-cap: "A long caption that I am using to demonstrate my problem
with long captions."
flowchart TB
  A(A) --> B(B)
  B --> C(C)

The caption (in reality much longer than this) wraps over several lines. In the VSCode file I get a warning Key fig-cap has empty value but it must instead be a string.
I've tried using \ separators at the end of lines, and using """ docstring-type quotes but these don't help.
Can't find an answer after searching the docs and github issues.
Hope someone can help.
Thanks!

[jjallaire]

This requires a YAML multi-line string. Like this:

```{mermaid}
%%| label: fig-components
%%| fig-cap: | 
%%|   A long caption that I am using to demonstrate my problem
%%|   with long captions
flowchart TB
  A(A) --> B(B)
  B --> C(C)
```

[Rockgecko]

Thanks, that's exactly what I needed.