Hello Joomlers!
I'm sharing with you this free plugin I developed for jDownloads: Alamarte Opengraph for jDownloads.
(https://alamarte.com/images/alamarte/Alamarte-og-jdownloads.png)
You can download it from my website: https://alamarte.com/descargas/extensiones/plugins-joomla/opengraph-para-jdownloads#changelog
I hope it's helpful for improving the appearance of social media sharing.
It only works with com_jdownloads, so it won't affect the Opengraph functionality on your other pages, if you have any.
Kind regards and Merry Christmas for all!