Is it possible to implement tables with two headers in pandoc?

[aubertc]

Typically, the following

princomp.github.io/source/lectures/intro/operators.md

Lines 102 to 105 in 29ac157

	| | Increment | Decrement |
	| ------- | ------- | ------- |
	| Postfix | `myVar++` | `myVar--` |
	| Prefix | `++myVar` | `--myVar` |

should be rendered as a "two header table" to comply with

https://webaim.org/techniques/tables/data#th

as far as I understand.