Subfigure caption indicator at the top left corner

[rgaiacs]

Related issue: https://github.com/quarto-dev/quarto-cli/issues/90

Thanks for all the fabulous work.

Would be possible to allow users to place the subfigure caption indicator at the top left corner of the image and keep the figure caption at the bottom?

For example,

---
fig-sub-cap-location: top
fig-sub-cap-merge: true
---

::: {#fig-elephants layout-ncol="2"}
![Surus](elephant.png){#fig-surus}

![Hanno](elephant.png){#fig-hanno}

Famous Elephants
:::

would give

[jjallaire]

Thanks for the feedback. We'll be looking more closely at captions/subcaptions later this fall and will hopefully make some improvements along these lines then.

[see24]

Being able to set the sub caption location would be an extremely helpful feature for scientific writing especially if it also applied to figures created in computations!