Hi there, here the answer of the developer of Argdown:
Hi Welstand (Welstand) · GitHub, sorry for not answering sooner. I took a quick look at the sample plugin when you posted the link. The plugin did not contain an example of how to configure the Markdown parser (or add plugins to it), so I did not want to spend more time on this (as I am currently working full-time on other projects). There probably is a way to do this (and it’s probably not that hard), so maybe you can find another Obsidian user who can write the plugin. I am willing to help, but at the moment I will not do it myself.
Do you have any idea who can we ask for it?