[Feature Request] Support for webm in cover image

[4HMZA]

Would it be possible to add support for use of webm to the cover image section of pages.
This would increase page performance compared to gifs.

[4HMZ4]

So I found this and it references and extended version of Hugo which adds support for webp.

Question 1) would adding webm to this also work
Question 2) where do I get the extended Hugo binary

[4HMZ4]

So I compiled the Hugo extended version and added webm to the line after hugo.IsExtended and it did not work. could just be me but from my testing this was a dud. It should be possible as I am able to use the webm format elsewhere in the posts

[adityatelange]

• Add webp to processable formats #540 Adds this. You can use Hugo's extended version for that to work.