How can I use [@ref] in a figure context in latex?

Question

I want to display multiple figures next to each other like in this. Every image has its own source so I want to mention this in the caption.

For this I want to add the source of a figure in the caption with [@testQuelle] but it just shows the text [@testQuelle] under the picture. What am I doing wrong?

When I try to cite my source outside the figure context it just works fine so my bib is fine (see the code)

---
header-includes: |
    \usepackage{graphicx}
    \usepackage{caption}
    \usepackage{subcaption}
---
nach [@testQuelle] ist es..
\begin{figure} 
    \centering
    \caption{myCaption [@ref] }
    \label{fig:myLabel} 
\end{figure}

@online{testQuelle,
  langid = {german},
  title = {eine Test Quelle aus dem Internet},
  url = {https://testQuelle.de},
  abstract = {diese Quelle enthält viele tolle Daten},
  journaltitle = {Quelle},
  urldate = {2019-06-05},
}

#!/bin/sh
PATH=$PATH:/home/moritz/.cabal/bin/ pandoc --filter pandoc-citeproc --bibliography quellen.bib --csl=styles/din1505.csl --filter pandoc-include-code -V hyphens=URL -V breakurl -V papersize=a4paper --from=markdown --output=text.pdf  text.md \
--template template 

Answer 1

The main issue is that pandoc recognizes the figure statement as raw LaTeX. This means all contained Markdown expressions, like myCaption [@ref], cannot be recognized as such and will be treated as LaTeX.

The way around this is to be more explicit about what's raw LaTeX, and what's Markdown. This is possible by using generic raw attributes (requires pandoc version 2 or newer):

```{=latex}
\begin{figure} 
    \centering
```

`\caption{`{=latex}myCaption [@ref]`}`{=latex}

```{=latex}
    \label{fig:myLabel} 
\end{figure}
```