I would also benefit from the ability to embed .webarchive files.
In my case I either save or export PDFs from web sites when archiving information, but occasionally the page contains animated GIFs or other media that is preserved in a .webarchive file but is lost in the PDF format. In cases like that it is very convenient to just save the page as a .webarchive.
As of 20220216 in Obsidian v. 0.13.19 I see the .webarchive files in my Obsidian File explorer, but clicking on the file opens it in my web browser. I have tried to embed the files with <iframe src="path"></iframe> without success.
If anyone has another method to embed such active web content from Safari in macOS I would appreciate greatly if you could share.