Support for metadata key

[aleixalcacer]

Hi,

it seems that funding YAML metadata (https://quarto.org/docs/authoring/front-matter.html#funding) is not supported.

For the following example:

---
title: This is the title
funding: "This work was supported by X [aaa code]."
format:
  elsevier-pdf: default
abstract: "This is the abstract."
author:
  - name: Aleix Alcacer
---

Some text.

I get:

Is there something I'm doing wrong or is it just not supported? If not, could it be implemented?

Aleix :)

[aleixalcacer]

See #22