Since I can't find a plugin for a link previewer, I made a custom but still in development.
My original plan is to edit the main renderer but I can't find any reference to edit that. So for now a little panel should do to display the links on an open Markdown
The Note Link System plugin includes a popup preview feature on hovering over local and remote links in the main renderer.
It looks like that feature's code can be found in lines 7000 to 7200 of the plugin's web view Javascript source. Does this help you as a reference?
Yep I'll check that, thanks for the reference