Mermaid diagram title frontmatter support

[devdiva]

Bug description

Desired outcome is to add a title or Figure label and/or figure caption to a mermaid diagram in a qmd file.

Quarto documentation shows figure labeling for graphviz dot, but same syntax does not work with mermaid.
https://quarto.org/docs/authoring/diagrams.html#figures

The outcome of this mermaid issues has support for adding title support to yaml frontmatter. However this does not appear to work with qmd output in Rstudio (get a syntax error).
mermaid-js/mermaid#3706

Mac OS Ventura 13.2.1, M1 Pro chip
Rstudio Version 2023.030.0+386

quarto check
[✓] Checking Quarto installation......OK      Version: 1.2.335      Path: /Users/hk/Applications/RStudio.app/Contents/Resources/app/quarto/bin
[✓] Checking basic markdown render....OK
[✓] Checking Python 3 installation....OK      Version: 3.9.6      Path: /Applications/Xcode.app/Contents/Developer/usr/bin/python3      Jupyter: (None)      Jupyter is not available in this Python installation.      Install with python3 -m pip install jupyter
[✓] Checking R installation...........OK      Version: 4.2.1      Path: /Library/Frameworks/R.framework/Resources      LibPaths:        - /Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/library      rmarkdown: 2.16
[✓] Checking Knitr engine render......OK

Attached qmd file (renamed .txt in order to upload through github)
MermaidTitle.qmd.txt

Checklist

• Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
• Please format your issue so it is easier for us to read the bug report.
• Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
• Please document the operating system you're running. If on Linux, please provide the specific distribution.
• Please provide the output of quarto check so we know which version of quarto and its dependencies you're running.

[cscheid]

---
format:
  html:
    theme: journal
    mermaid:
      theme: forest
---

# Mermaid Test

```{mermaid}
---
title: FOO
---
flowchart TB
  x --> yyyy
```

We don't support that syntax in cells; that front matter doesn't refer to mermaid (I don't know how that is being supported in dot cases, but that's a coincidence). You need to use options delimited by %%|, since %% is the comment syntax in mermaid. We describe this in the documentation.