HTML table with rowspan to grid table

[aborruso]

Hi,
I have this HTML table, and I want to convert it to grid table, maintaining its rowspan cells, to get something similar to

+---------------------+----------+
| Property            | Earth    |
+=============+=======+==========+
|             | min   | -89.2 °C |
| Temperature +-------+----------+
| 1961-1990   | mean  | 14 °C    |
|             +-------+----------+
|             | max   | 56.7 °C  |
+-------------+-------+----------+

But if I run pandoc -s input.html -t markdown+grid_tables -o output.md I do not have the rowspan in the output.
Is there a way to force to create it?

Thank you

[jgm]

The markdown writer doesn't yet support row or colspans.

[jgm]

This would be a great project for someone who wants to work on the pandoc code base!

[jgm]

Actually this is a dup of #6344 - closing in favor of that.